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If (a=60) and (d=-6), what is the (9)th term?

Answer and explanation

Correct answer: 12

The nth term of an AP is \(a_n=a+(n-1)d\). Thus, \(a_9=60+(9-1)(-6)=60-48=12\). Therefore, 12 is the correct answer. You may get 18 if you incorrectly treat the negative common difference \(-6\) as positive. Exam tip: when \(d\) is negative, the terms decrease.

Related tags

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

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