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What is the (n)th term of the sequence (2,4,6,8,\ldots)?

Answer and explanation

Correct answer: \(2n\)

This is an arithmetic progression with first term \(a=2\) and common difference \(d=2\). Therefore, \(a_n=a+(n-1)d=2+(n-1)\times2=2n\). Hence, the correct answer is \(2n\). The expression \(2n-1\) generates odd numbers, whereas every term in this sequence is even. Exam tip: always test a proposed nth-term formula at \(n=1\); \(2n\) gives the first term \(2\).

Related tags

SequencesArithmetic ProgressionNth TermEven NumbersAlgebraSequences And ProgressionsMathematicsClass 9 Mcq

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