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What is the sum of the first (12) odd natural numbers?

Answer and explanation

Correct answer: (144)

Direct answer: option C, 144. The odd natural numbers begin 1, 3, 5, 7, and continue by adding 2. For the first n odd numbers, the sum is n^2. Here n=12, so S=12^2=12×12=144. Equivalently, the terms are 1,3,5,7,9,11,13,15,17,19,21,23; pairing or adding them also gives 144. Option A, 121, is 11^2, so it would be the sum of the first 11 odd numbers, not 12. Option B, 132, does not follow the odd-number sum rule and is too small. Option C, 144, exactly matches 12^2, so it is correct. Option D, 156, is also not the required square and is too large. Remember: the sum of the first n odd numbers is always n^2.

Related tags

Odd NumbersSumAp

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