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Inference from Conditional Chain

Introduction

இந்த pattern, பல conditional (“If-Then”) statements ஒன்றோடொன்று இணைந்து ஒரு logical chain உருவாகும் கேள்விகளை மையமாகக் கொண்டது. முக்கியமான திறன் என்னவென்றால், இந்த conditions-ஐ படிப்படியாக இணைத்து சரியான final inference-ஐ எடுப்பது.

இத்தகைய கேள்விகள் analytical reasoning மற்றும் logical deduction sections-ல் பொதுவாக வருகின்றன; implications chain-ஐ துல்லியமாக பின்பற்றும் உங்கள் திறனை இவை சோதிக்கின்றன.

Pattern: Inference from Conditional Chain

Pattern

பல ‘If-Then’ statements இணைக்கப்பட்டால், ஒரு condition உண்மையானபோது அதனால் தொடர்ச்சியான பல விளைவுகள் உருவாகலாம்.

Example Structure:
If A → B, and B → C, then logically A → C.

இந்த validity forward direction-ல் மட்டுமே பொருந்தும் - ஆரம்ப condition true என்றால், அதனைத் தொடர்ந்து இணைந்த அனைத்து effects-உம் follow ஆகும்.

Step-by-Step Example

Question

Statements:
1️⃣ If it rains, the ground gets wet.
2️⃣ If the ground gets wet, the football match will be postponed.
3️⃣ It has started raining.

கீழ்கண்டவற்றில் எந்த conclusion கண்டிப்பாக follow ஆகிறது?
(A) The match will be postponed.
(B) The ground will not get wet.
(C) The match will start on time.
(D) Nothing can be concluded.

Solution

  1. Step 1: Identify the chain

    Rains → Ground Wet → Match Postponed.
  2. Step 2: Apply the given condition

    மழை தொடங்கியுள்ளது ⇒ தரை நனைவது ⇒ match ஒத்திவைப்பு.
  3. Step 3: Verify options

    Option A மட்டுமே conditional chain-இலிருந்து நேரடியாக follow ஆகிறது.
  4. Final Answer:

    The match will be postponed → Option A
  5. Quick Check:

    If P → Q → R மற்றும் P true ⇒ R true ✅

Quick Variations

  • 1. 3-5 conditions கொண்ட multi-step chains (If A → B, B → C, C → D...)
  • 2. Reverse inference traps (“If D → C” என்பது “A → D” என்பதைக் குறிக்காது)
  • 3. False condition inputs (முதல் premise false என்றால், எந்த conclusion-உம் follow ஆகாது)
  • 4. Nested அல்லது double-condition problems (“If A and B → C”)

Trick to Always Use

  • Shared terms பயன்படுத்தி அனைத்து statements-ஐ இணைத்து தெளிவான logical chain உருவாக்கவும்.
  • கொடுக்கப்பட்ட true condition-இலிருந்து தொடங்கி forward-ஆக நகரவும்; backward-ஆக அல்ல.
  • முதல் condition false என்றால், பின்னர் வரும் steps பற்றி எந்த உறுதியான முடிவும் எடுக்க முடியாது.
  • Negation logic-ஐ மாற்றும்: (If P → Q) என்பதன் contrapositive என்பது (If not Q → not P).

Summary

Summary

  • அனைத்து ‘If-Then’ statements-ஐ ஒரே linear chain-ஆக இணைக்கவும்.
  • ஆரம்ப condition true என்றால், அதனைத் தொடர்ந்து வரும் அனைத்து outcomes-உம் true.
  • ஆரம்ப condition false என்றால், எந்த definite conclusion-உம் எடுக்க முடியாது.
  • எப்போதும் reasoning direction-ஐ சோதிக்கவும் - forward மட்டும், backward அல்ல.

நினைவில் வைக்க வேண்டிய example:
If A → B, B → C, மற்றும் A true ⇒ C true ✅

Practice

(1/5)
1. Statements:<br>1️⃣ If the machine is on, the lights will glow.<br>2️⃣ If the lights glow, the room will be visible.<br>3️⃣ The machine is on.<br><br>Which of the following conclusions definitely follows?<br>(A) The lights are off.<br>(B) The room will be visible.<br>(C) The room will remain dark.<br>(D) The lights will not glow.
easy
A. The lights are off.
B. The room will be visible.
C. The room will remain dark.
D. The lights will not glow.

Solution

  1. Step 1: Identify chain

    Machine On → Lights Glow → Room Visible.
  2. Step 2: Apply given fact

    Machine is on ⇒ Lights glow ⇒ Room visible.
  3. Final Answer:

    The room will be visible → Option B
  4. Quick Check:

    P → Q → R; P true ⇒ R true ✅
Hint: If first condition is true, carry the chain forward logically.
Common Mistakes: Stopping after one inference instead of completing the chain.
2. Statements:<br>1️⃣ If it rains, the road becomes slippery.<br>2️⃣ If the road is slippery, accidents increase.<br>3️⃣ It has started raining.<br><br>Which of the following conclusions definitely follows?<br>(A) Accidents may increase.<br>(B) The road will remain dry.<br>(C) The road will be closed.<br>(D) Accidents will decrease.
easy
A. Accidents may increase.
B. The road will remain dry.
C. The road will be closed.
D. Accidents will decrease.

Solution

  1. Step 1: Chain logic

    Rain → Slippery → Accidents increase.
  2. Step 2: Given fact

    Rain started ⇒ both consequences follow.
  3. Final Answer:

    Accidents may increase → Option A
  4. Quick Check:

    Rain triggers the entire chain ✅
Hint: From a true starting event, carry to the final consequence.
Common Mistakes: Ignoring transitive middle link (slippery road).
3. Statements:<br>1️⃣ If a student studies well, they will pass the exam.<br>2️⃣ If they pass the exam, they will get a certificate.<br>3️⃣ Riya has studied well.<br><br>Which of the following conclusions definitely follows?<br>(A) Riya will get a certificate.<br>(B) Riya will fail the exam.<br>(C) Riya will not get a certificate.<br>(D) Riya did not study well.
easy
A. Riya will get a certificate.
B. Riya will fail the exam.
C. Riya will not get a certificate.
D. Riya did not study well.

Solution

  1. Step 1: Build chain

    Studies well → Pass Exam → Get Certificate.
  2. Step 2: Given

    Riya studied well ⇒ Passes exam ⇒ Gets certificate.
  3. Final Answer:

    Riya will get a certificate → Option A
  4. Quick Check:

    P → Q → R; P true ⇒ R true ✅
Hint: When the first condition is true, all following effects occur.
Common Mistakes: Assuming uncertainty when all links are definite.
4. Statements:<br>1️⃣ If electricity fails, the alarm will stop.<br>2️⃣ If the alarm stops, the guard will check the system.<br>3️⃣ Electricity has failed.<br><br>Which of the following conclusions definitely follows?<br>(A) The alarm will stop.<br>(B) The guard will check the system.<br>(C) Both A and B follow.<br>(D) The alarm will ring continuously.
medium
A. The alarm will stop.
B. The guard will check the system.
C. Both A and B follow.
D. The alarm will ring continuously.

Solution

  1. Step 1: Build chain

    Electricity fails → Alarm stops → Guard checks system.
  2. Step 2: Apply fact

    Electricity failed ⇒ both events occur.
  3. Final Answer:

    Both A and B follow → Option C
  4. Quick Check:

    Two-step logical chain ✅
Hint: When multiple consequences follow, mark both if chain is complete.
Common Mistakes: Stopping at first effect (alarm stop) only.
5. Statements:<br>1️⃣ If a country increases exports, its income rises.<br>2️⃣ If income rises, living standards improve.<br>3️⃣ Exports have increased.<br><br>Which of the following conclusions definitely follows?<br>(A) The country’s living standards will improve.<br>(B) The country’s income will fall.<br>(C) The living standards will decline.<br>(D) No definite conclusion can be drawn.
medium
A. The country’s living standards will improve.
B. The country’s income will fall.
C. The living standards will decline.
D. No definite conclusion can be drawn.

Solution

  1. Step 1: Link

    Increase Exports → Income Rises → Living Standards Improve.
  2. Step 2: Given fact

    Exports increased ⇒ Income rises ⇒ Living standards improve.
  3. Final Answer:

    The country’s living standards will improve → Option A
  4. Quick Check:

    P → Q → R; P true ⇒ R true ✅
Hint: From first true cause, every next effect in the chain must hold.
Common Mistakes: Confusing correlation with conditional certainty.

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