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What is the (11)th term of the AP (8,15,22,29,\ldots)?

Answer and explanation

Correct answer: \(78\)

In this AP, the first term is \(a=8\) and the common difference is \(d=15-8=7\). The \(n\)th term is given by \(a_n=a+(n-1)d\). Therefore, \(a_{11}=8+(11-1)\times7=8+70=78\). Hence, \(78\) is correct. Getting \(76\) usually results from using an incorrect number of differences instead of \(n-1\). Exam tip: for the \(n\)th term, always add \(n-1\) common differences to the first term.

Related tags

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

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