PRC-2 · Chapter 3 · Question 24 of 45
Using the standard mathematical shortcut formula for arithmetic series, what is the exact sum of the first 20 natural numbers (1 + 2 + 3 + ... + 20)?
Test yourself: pick an answer
Reveal answer & explanation
Correct answer: C) 210
Explanation
The specific formula for the sum of the first 'n' natural numbers is n(n + 1) / 2. Here, 20(21) / 2 = 420 / 2 = 210.
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