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In an AP, (a_5=18) and (a_9=34). What is the common difference?

Answer and explanation

Correct answer: 4

In an AP, the difference between two terms equals the difference in their positions multiplied by the common difference. Thus, \(a_9-a_5=(9-5)d\), so \(34-18=4d\). Hence \(16=4d\) and \(d=4\). Option 16 is the difference between the two given terms, not the common difference. Exam tip: find the difference in term numbers first, then divide the term difference by it.

Related tags

Arithmetic ProgressionCommon DifferenceAp TermsLinear SequencesClass 10 MathematicsIntroduction To Aps And Common Difference.Introduction To Aps And Common DifferenceArithmetic Progressions (Ap)

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