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In an AP, (a_p=17), (a_{p+8}=65), and (p=6). What is (a_{30})?

Answer and explanation

Correct answer: 161

Since \(p=6\), we have \(a_p=a_6=17\) and \(a_{p+8}=a_{14}=65\). Thus, \(a_{14}-a_6=8d=65-17=48\), so \(d=6\). Now, \(a_{30}=a_6+(30-6)d=17+24\times6=161\). Hence, 161 is correct. Choosing 155 would not use the correct gap of \(30-6=24\) terms. Exam tip: In questions with indexed terms, substitute the value of \(p\) first and write the actual term numbers.

Related tags

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

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