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In the sequence (1,3,7,15,31,\ldots), which term is (127)?

Answer and explanation

Correct answer: 7th term

Each term in this sequence is obtained by doubling the previous term and adding 1. Its nth term is \(a_n=2^n-1\). Since \(2^7-1=128-1=127\), 127 is the seventh term. The sixth term is \(2^6-1=63\), so it is not correct. Exam tip: add 1 to the terms to identify powers of 2 in such sequences.

Related tags

SequencesGeometric PatternPowers Of TwoNth TermClass 9 MathematicsSequences And ProgressionsMathematicsClass 9 Mcq

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