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What is the (7)th term of the geometric progression (6,12,24,\ldots)?

Answer and explanation

Correct answer: 384

In this geometric progression, the first term is \(a=6\) and the common ratio is \(r=\frac{12}{6}=2\). The \(n\)th term is \(a_n=ar^{n-1}\). Hence, \(a_7=6\times2^{7-1}=6\times64=384\). Option 192 equals \(6\times2^5\), so it is the sixth term. Exam tip: in a GP, the exponent in the nth-term formula is \(n-1\), not \(n\).

Related tags

MathematicsGeometric ProgressionSequencesNth TermCommon RatioSequences And ProgressionsClass 9 Mcq

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