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If (a=5) and (d=-1), find the (20)th term of the AP.

Answer and explanation

Correct answer: -14

The nth term of an AP is \(a_n=a+(n-1)d\). Thus, \(a_{20}=5+(20-1)(-1)=5-19=-14\). Therefore, \(-14\) is correct. The value \(-13\) would result from incorrectly using 18 in place of \(n-1\). Exam tip: always multiply the common difference by \(n-1\) when finding the nth term.

Related tags

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

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