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If (a=11) and (a_{12}=88), what is (d)?

Answer and explanation

Correct answer: 7

The formula for an arithmetic progression is \(a_n=a+(n-1)d\). Hence, \(a_{12}=a+11d\). Substituting the given values, \(88=11+11d\), so \(11d=77\) and \(d=7\). Therefore, option C is correct. If \(d=8\), the twelfth term would be \(99\), not the given value. Exam tip: the coefficient of \(d\) in the \(n\)th term is always \(n-1\).

Related tags

Arithmetic ProgressionNth TermCommon DifferenceSequencesClass 9 MathematicsSequences And ProgressionsMathematicsClass 9 Mcq

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