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If in an AP (a_{35}=a_{11}+288), what is the common difference?

Answer and explanation

Correct answer: 12

For an AP, \(a_n=a+(n-1)d\). Therefore, \(a_{35}-a_{11}=(35-11)d=24d\). Given \(a_{35}-a_{11}=288\), we get \(24d=288\), so \(d=288/24=12\). The gap between the term numbers is 24; using an incorrect gap gives a wrong value. Exam tip: use \(a_m-a_n=(m-n)d\) directly in such questions.

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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