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If (a_6=31) and (a_{14}=79), what is the common difference of the AP?

Answer and explanation

Correct answer: 6

For an AP, \(a_{14}-a_6=(14-6)d\). Thus, \(79-31=8d\), so \(48=8d\) and \(d=6\). If the common difference were 4, the difference over 8 positions would be only 32, not the given 48. Exam tip: when two non-consecutive terms are given, divide the difference of the terms by the difference of their indices.

Related tags

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

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