Staff Selection Commission Quantitative Aptitude — Question 257

Question

Find the value of (25)^2 - (24)^2

1. 49
2. 48
3. 50
4. 51

Correct answer

A — 49

Explanation (English)

Using a^2 - b^2 = (a+b)(a-b): (25+24)(25-24) = 49 × 1 = 49

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