What is the sum of all whole numbers from 1 to 50?
Correct answer: B. 1,275
Use the formula n(n + 1) ÷ 2 = 50 × 51 ÷ 2 = 1,275. It works because the numbers pair up: 1 + 50, 2 + 49 and so on give 25 pairs of 51.
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Answer and explanation
The correct answer is B. 1,275
Use the formula n(n + 1) ÷ 2 = 50 × 51 ÷ 2 = 1,275. It works because the numbers pair up: 1 + 50, 2 + 49 and so on give 25 pairs of 51.
Topic: Age and Number Problems MCQs · Subject: Numerical Ability