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Rank after Removal

Introduction

Rank-after-removal वाले questions यह पूछते हैं कि जब कुछ लोग लाइन या class से हट जाते हैं, तो किसी व्यक्ति की rank कैसे बदलती है। ऐसे questions aptitude tests में बहुत आते हैं क्योंकि इनमें ध्यान से गिनती करनी पड़ती है - कौन हटे हैं (ahead या behind) यही मुख्य बात होती है।

इस pattern को समझकर आप जल्दी से ranks update कर सकते हैं, चाहे लोग हटें या नए लोग जुड़ें।

Pattern: Rank after Removal

Pattern

मुख्य विचार: Rank सिर्फ तभी बदलती है जब हटने वाले लोग उस व्यक्ति से आगे हों - new_rank = old_rank - (हटाए गए ahead लोगों की संख्या).

Variants जो पहचानने ज़रूरी हैं:

  • अगर x लोग जो आगे थे हट जाएँ → new rank = old rank - x
  • अगर x लोग पीछे से हटें → rank वही रहती है
  • अगर आगे और पीछे दोनों से लोग हटें → सिर्फ आगे वालों की संख्या घटाएँ
  • अगर new total strength पूछी जाए → new total = old total - removed

Step-by-Step Example

Question

Class में 40 students हैं। Ravi top से 10th है। पाँच students जो Ravi से आगे थे, class छोड़ देते हैं। Ravi की नई rank क्या होगी?

Solution

  1. Step 1: Original data समझें

    Total = 40; Ravi की old rank = 10 → उससे आगे 9 छात्र थे।
  2. Step 2: Ahead हटने वालों की संख्या

    Question में दिया है कि 5 लोग जो Ravi से आगे थे, class छोड़ते हैं।
  3. Step 3: Rule लागू करें

    New rank = old rank - removed_ahead = 10 - 5 = 5
  4. Final Answer:

    Ravi की नई rank top से 5th है।
  5. Quick Check:

    पहले 9 आगे थे → 5 हट गए → 4 आगे बचे → 4 + 1 = 5th ✅

Quick Variations

1. अगर पीछे वाले हटें → rank नहीं बदलती (सिर्फ total बदलता है)।

2. अगर removals दिए हों लेकिन यह न बताया हो कि ahead या behind हैं, तो उनकी positions identify करें।

3. Mixed removal हो (कुछ आगे, कुछ पीछे) → सिर्फ ahead वालों की संख्या rank में असर डालती है।

4. New rank bottom से चाहिए हो तो पहले new total निकालें, फिर convert करें: New bottom = new_total - new_top + 1

Trick to Always Use

  • Step 1 → Rank को “people ahead” में बदलें: people_ahead = rank - 1
  • Step 2 → Removed ahead घटाएँ: new_people_ahead = people_ahead - removed_ahead
  • Step 3 → वापस rank में बदलें: new_rank = new_people_ahead + 1

Summary

Summary

  • जो लोग आगे से हटते हैं, वही rank घटाते हैं।
  • पीछे से हटने वालों से rank नहीं बदलती।
  • Mixed removal में सिर्फ ahead वाले count करें।
  • Bottom rank के लिए पहले new total निकालें और फिर convert करें: bottom = total - top + 1

Example to remember:
अगर कोई 12th है और 3 लोग जो उससे आगे थे हट जाएँ → new rank = 12 - 3 = 9th

Practice

(1/5)
1. In a class of 50 students, Anu is ranked 12th from the top. If 4 students ahead of her leave the class, what will be her new rank?
easy
A. 8th
B. 9th
C. 10th
D. 11th

Solution

  1. Step 1: Original rank

    Anu’s old rank = 12 → 11 students were ahead.
  2. Step 2: Removals ahead

    4 students ahead leave.
  3. Step 3: New rank

    New rank = 12 - 4 = 8th.
  4. Final Answer:

    8th → Option A
  5. Quick Check:

    Originally 11 ahead, now 7 ahead → 7 + 1 = 8 ✅
Hint: Subtract number of people ahead who leave from old rank.
Common Mistakes: Subtracting all removals instead of only those ahead.
2. In a competition of 40 participants, Rohan ranks 7th from the top. If 3 participants who were ahead of him are disqualified, what is his new rank?
easy
A. 3rd
B. 4th
C. 5th
D. 6th

Solution

  1. Step 1: Given

    Old rank = 7; 3 participants ahead leave.
  2. Step 2: Compute

    New rank = 7 - 3 = 4th.
  3. Final Answer:

    4th → Option B
  4. Quick Check:

    Before: 6 ahead → now 3 ahead → rank = 4 ✅
Hint: Remove count only for those before the given rank.
Common Mistakes: Subtracting from total participants instead of from rank.
3. In a class of 60 students, Priya is ranked 15th from the top. If 5 students behind her leave the class, what will be her new rank?
easy
A. 16th
B. 14th
C. 15th
D. 13th

Solution

  1. Step 1: Observation

    Students behind do not affect rank from top.
  2. Step 2: Result

    Her position from top remains the same = 15th.
  3. Final Answer:

    15th → Option C
  4. Quick Check:

    No change since all 5 were behind ✅
Hint: If only those behind leave, rank remains unchanged.
Common Mistakes: Incorrectly reducing rank when removals are behind.
4. In a test of 45 students, Amit is 9th from the top. If 2 students ahead and 3 behind him leave, what is his new rank?
medium
A. 5th
B. 6th
C. 8th
D. 7th

Solution

  1. Step 1: Identify relevant removals

    Only 2 ahead affect the rank.
  2. Step 2: Compute

    New rank = 9 - 2 = 7th.
  3. Final Answer:

    7th → Option D
  4. Quick Check:

    2 ahead left → Amit moves up by 2 positions ✅
Hint: Ignore removals behind - only those ahead matter.
Common Mistakes: Subtracting all removals instead of only ahead ones.
5. In a group of 30 people, Kavya ranks 8th from the top. If 4 people ahead of her and 2 behind her leave, what is her new rank?
medium
A. 4th
B. 3rd
C. 5th
D. 6th

Solution

  1. Step 1: Count only those ahead

    4 ahead leave → affects rank.
  2. Step 2: Compute

    New rank = 8 - 4 = 4th.
  3. Final Answer:

    4th → Option A
  4. Quick Check:

    4 ahead gone → Kavya moves from 8 → 4 ✅
Hint: Subtract only people ahead who left the line.
Common Mistakes: Reducing total and using that incorrectly to get rank.

Mock Test

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