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The first term of an AP is (18) and the (16)th term is (93). What is the common difference?

Answer and explanation

Correct answer: 5

For an AP, the nth-term formula is \(a_n=a+(n-1)d\). Here, \(a=18\) and \(a_{16}=93\), so \(93=18+15d\). Thus, \(15d=75\), giving \(d=5\). If the common difference were 4, the 16th term would be \(18+15\times4=78\), not 93. Exam tip: use \(n-1\), not \(n\), in the nth-term formula.

Related tags

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

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