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In the sequence (3,8,18,38,78,\ldots), each next term is obtained by doubling the previous term and adding (2). What will be the next term?

Answer and explanation

Correct answer: 158

The rule is: next term = twice the previous term + 2. Therefore, the term after 78 is \(2\times 78+2=156+2=158\). Although 156 is double of 78, the additional 2 must also be included. Exam tip: for a recurrence sequence, apply the stated rule directly to the last given term.

Related tags

SequencesRecurrence RelationNumber PatternsArithmetic OperationsClass 9 MathematicsSequences And ProgressionsMathematicsClass 9 Mcq

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