Numerical Ability - Simplification & Approximation
Find the sum of the first 7 even numbers.
Find the sum of the first 7 even numbers.
easy Q2 of 15
Step-by-Step Solution
Step 1: Recall the formula:
Sum of first n even numbers = n(n+1).Step 2: Compute for n = 7:
7 × 8 = 56.Final Answer:
56 → Option B.Quick Check:
2 + 4 + 6 + 8 + 10 + 12 + 14 = 56 ✅
Quick Trick: Use n(n+1) for even-number sums.
Common Mistakes:
- Using odd-number formula (n²) by mistake.
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