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If the first term of an AP is (16) and (a_{26}=116), what is (d)?

Answer and explanation

Correct answer: 4

The nth-term formula of an AP is \(a_n=a+(n-1)d\). Therefore, \(a_{26}=16+25d\). Given \(a_{26}=116\), we get \(116=16+25d\), so \(25d=100\) and hence \(d=4\). If 3 were used, the 26th term would be \(16+25\times3=91\), not 116. Exam tip: in \(a_n\), the common difference is multiplied by \(n-1\), not by \(n\).

Related tags

Arithmetic ProgressionCommon DifferenceNth TermClass 10 MathematicsLinear EquationsFinding The $N$Th Term Of An ApFinding The N Th Term Of An ApArithmetic Progressions (Ap)

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