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Find the (8)th term in the AP (18,23,28,33,\ldots).

Answer and explanation

Correct answer: \(53\)

In this AP, the first term is \(a=18\) and the common difference is \(d=23-18=5\). The \(n\)th term is given by \(a_n=a+(n-1)d\). Therefore, \(a_8=18+(8-1)\times5=18+35=53\). Hence, \(53\) is correct. Choosing \(58\) would add one extra common difference, making it the 9th term. Exam tip: for the \(n\)th term, add only \(n-1\) common differences.

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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