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If in an AP (a_{18}=a_6+84), what is the common difference?

Answer and explanation

Correct answer: 7

In an AP, the difference between two terms equals the difference of their positions multiplied by the common difference. Thus, \(a_{18}-a_6=(18-6)d=12d\). Given \(a_{18}-a_6=84\), we get \(12d=84\), so \(d=7\). The option 6 may result from counting the position gap incorrectly. Exam tip: use \(a_m-a_n=(m-n)d\) and subtract the indices carefully.

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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