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If a₃₀ = 8a₁₄ and a₁₄ = 51, what is a₄₆?

Answer and explanation

Correct answer: 765

Use the AP relation aₙ = aₘ + (n − m)d. Since a₁₄ = 51 and a₃₀ = 8a₁₄, we first calculate a₃₀ = 8 × 51 = 408. The index difference between 30 and 14 is 16, so a₃₀ − a₁₄ = 16d. Hence 408 − 51 = 357 = 16d. We do not need to simplify d fully, because the indices 46 and 30 also differ by 16. Therefore a₄₆ = a₃₀ + 16d = 408 + 357 = 765. Thus option B is correct. A common error is to multiply 51 by 8 again when finding a₄₆, or to use 46 − 14 without accounting for the already known term a₃₀. The equal index gaps provide the quickest reliable solution.

Related tags

Arithmetic ProgressionNth TermCommon DifferenceIndexed TermsFinding The $N$Th Term Of An ApFinding The N Th Term Of An ApArithmetic Progressions (Ap)Arithmetic Progressions Ap

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