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In an AP \(a=12\) and \(d=\frac{7}{2}\). What is \(a_{15}\)?

Answer and explanation

Correct answer: 61

The \(n\)th term of an AP is \(a_n=a+(n-1)d\). Therefore, \(a_{15}=12+(15-1)\times\frac{7}{2}=12+14\times\frac{7}{2}=12+49=61\). Hence, 61 is correct. A value such as 59 can result from using an incorrect number of common differences. Exam tip: always use \(n-1\), not \(n\), in the nth-term formula.

Related tags

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

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