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In the sequence (1,3,5,7,\ldots), which term is (31)?

Answer and explanation

Correct answer: sixteenth term

This is the sequence of odd numbers, whose nth term is \(a_n=2n-1\). Putting \(2n-1=31\) gives \(2n=32\), so \(n=16\). Therefore, 31 is the sixteenth term. The fifteenth term is \(2(15)-1=29\), so it is not correct. Exam tip: for a sequence of odd numbers, use \(2n-1\) as the nth-term formula.

Related tags

Sequences And ProgressionsNth TermOdd NumbersArithmetic ProgressionClass 9 MathematicsMathematicsClass 9 Mcq

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