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What is the sum of the first 16 odd natural numbers?

Answer and explanation

Correct answer: 256

The governing concept is the sum of the first n odd natural numbers, which is n², or equivalently the sum formula for an arithmetic progression. The first 16 odd numbers are 1, 3, 5, ..., 31, so a = 1, d = 2, and n = 16. Using the identity, the sum is 16² = 256. The AP formula confirms this: S₁₆ = n/2[2a + (n − 1)d] = 16/2[2(1) + 15(2)] = 8(2 + 30) = 8 × 32 = 256. Therefore option B is correct. Option A, C, or D could result from miscounting the terms, using an incorrect last term, or making an arithmetic error. The result is also consistent with the familiar pattern that the sum of the first n odd numbers forms the square n².

Related tags

Odd NumbersAp SumArithmetic ProgressionNatural NumbersFinding The Sum Of The First $N$ Terms Of An ApFinding The Sum Of The First N Terms Of An ApArithmetic Progressions (Ap)Arithmetic Progressions Ap

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