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In an AP, (a=9), (d=2). Find the (18)th term.

Answer and explanation

Correct answer: 43

The nth term of an arithmetic progression is given by \(a_n=a+(n-1)d\). Thus, \(a_{18}=9+(18-1)\times2=9+34=43\), so the correct answer is 43. The distractor 45 results from incorrectly using \(18d\) instead of \((18-1)d\). Exam tip: always use \(n-1\) when finding the nth term from the first term.

Related tags

Nth TermArithmetic ProgressionCommon 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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