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If the first term of an AP is (-2) and the common difference is (6), what is the (12)th term?

Answer and explanation

Correct answer: 64

The formula for the nth term of an AP is \(a_n=a+(n-1)d\). Here, \(a=-2\), \(d=6\), and \(n=12\). Thus, \(a_{12}=-2+(12-1)\times6=-2+66=64\). Therefore, 64 is the correct answer. The nearby option 66 is only \(11\times6\); it does not include the first term \(-2\). Exam tip: use \((n-1)\), not \(n\), in the nth-term formula.

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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