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In the sequence (14,22,30,38,\ldots), which term is (126)?

Answer and explanation

Correct answer: 15th

This is an arithmetic progression with first term 14 and common difference 8. Its nth term is \(a_n=14+(n-1)\times 8\). On setting \(14+(n-1)\times 8=126\), we get \(n-1=14\), hence \(n=15\). Therefore, 126 is the 15th term. The 14th term is 118, so it is a close but incorrect option. Exam tip: while finding a term number, be careful to use \(n-1\) in the AP formula.

Related tags

Arithmetic ProgressionSequenceNth TermCommon DifferenceClass 9 MathematicsSequences And ProgressionsMathematicsClass 9 Mcq

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