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In an AP, a₁₆ = 4a₇ + 2 and a₇ = 22. What is a₃₄?

Answer and explanation

Correct answer: 226

The governing concept is the nth-term relation in an arithmetic progression: aₙ = aₘ + (n − m)d, where d is the common difference. Since a₇ = 22, the given condition gives a₁₆ = 4(22) + 2 = 90. The indices 16 and 7 differ by 9, so a₁₆ − a₇ = 9d. Hence 90 − 22 = 9d, which gives d = 68/9. To reach the 34th term from the 7th term, move through 34 − 7 = 27 equal steps. Thus a₃₄ = 22 + 27(68/9) = 22 + 204 = 226. Therefore option A is correct. Options B, C and D arise from incorrect multiplication or from using the wrong index difference; none satisfies the AP relation with the stated data.

Related tags

Arithmetic ProgressionNth TermCommon DifferenceClass 10 MathematicsFinding The $N$Th Term Of An ApFinding The N Th Term Of An ApArithmetic Progressions (Ap)Arithmetic Progressions Ap

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