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Which recursive rule is correct for the sequence (10,17,31,59,\ldots)?

Answer and explanation

Correct answer: \(a_1=10,\ a_{n+1}=2a_n-3\)

In option B, \(a_1=10\). Applying the rule gives \(2(10)-3=17\), \(2(17)-3=31\), and \(2(31)-3=59\), so it matches every given term. In option A, the next term would be 24, while option D has the wrong first term. Exam tip: when checking a recursive rule, verify the initial term and at least two subsequent terms.

Related tags

Recursive SequencesRecursive RuleSequences And ProgressionsClass 9 MathematicsNumber PatternsMathematicsClass 9 Mcq

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