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Which recursive rule correctly represents a geometric sequence whose first term is 5 and in which each successive term is twice the preceding term?

Answer and explanation

Correct answer: \(a_1=5,\ a_{n+1}=2a_n\)

In a geometric sequence, each term is obtained by multiplying the preceding term by a fixed ratio. Here the ratio is 2, so \(a_{n+1}=2a_n\). Check: the second term is \(2\times5=10\). In exams, “twice” means multiply by 2, not add 2.

Related tags

MathematicsSequencesProgressionsRecursive RuleGeometric SequenceClass 9Sequences And ProgressionsClass 9 Mcq

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