PRC-2 · Chapter 3 · Question 14 of 45
Which of the following is the standard shortcut formula used for finding the sum of the first 'n' natural numbers (1 + 2 + 3 + ... + n)?
Test yourself: pick an answer
Reveal answer & explanation
Correct answer: A) n(n + 1)/2
Explanation
A sequence of natural numbers is an arithmetic series where a=1 and d=1. Using the formula S = n/2(2a + (n-1)d) results in S = n/2(2 + n - 1) = n(n + 1)/2.
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