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Find the (15)th term of the AP (40,36,32,28,\ldots).

Answer and explanation

Correct answer: \(-16\)

For this AP, the first term is \(a=40\) and the common difference is \(d=36-40=-4\). The \(n\)th term is \(a_n=a+(n-1)d\). Therefore, \(a_{15}=40+(15-1)(-4)=40-56=-16\). Hence, option \(\text{C}\) is correct. \(-20\) would be obtained for the 16th term, not the 15th term. Exam tip: for the \(n\)th term, use the common difference \((n-1)\) times.

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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