Numerical Ability - Simplification & Approximation
Find the sum of the first 20 odd numbers.
Find the sum of the first 20 odd numbers.
medium Q8 of 15
Step-by-Step Solution
Step 1: Recall the formula:
Sum of n odd numbers = n².Step 2: Compute for n = 20:
20² = 400.Final Answer:
400 → Option D.Quick Check:
Average odd term = 20; 20 × 20 = 400 ✅
Quick Trick: Odd-number sums equal n²—fast and exact.
Common Mistakes:
- Counting incorrect number of odd terms.
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