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If in an AP (a_{22}=a_7+120), what is the common difference?

Answer and explanation

Correct answer: 8

For an AP, \(a_n=a+(n-1)d\). Therefore, \(a_{22}-a_7=(22-7)d=15d\). From the given relation, \(15d=120\), so \(d=8\). If the common difference were 9, the difference would be \(15\times 9=135\), not 120. Exam tip: when two terms are given, subtract their indices and multiply the result by \(d\).

Related tags

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

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