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What is the (22)nd term of the AP (2,9,16,23,\ldots)?

Answer and explanation

Correct answer: (149)

The direct answer is option B: the 22nd term is 149. The first term is a = 2. The common difference is d = 9 − 2 = 7, and the later differences also equal 7. Use an = a + (n − 1)d. For n = 22, a22 = 2 + (22 − 1)7 = 2 + 21 × 7 = 2 + 147 = 149. Therefore option B is correct. Option A, 142, is 21 × 7 without adding the first term, so it is one part of the calculation rather than the term. Option C, 156, uses an excessive amount and does not follow the formula. Option D, 147, again represents 21 × 7 and omits the first term. From the first term to the 22nd term there are 21 equal jumps. Memory cue: nth term = first term + number of jumps × common difference, and number of jumps is n − 1.

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Ap FormulaNth TermEasy Level

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