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Which recursive rule matches the sequence (100, 50, 25, ...)?

Answer and explanation

Correct answer: a_1 = 100, a_(n+1) = a_n/2

The governing concept is a recursive rule involving a fixed multiplier. The sequence starts at 100, and every term is half of the preceding term: 100 ÷ 2 = 50 and 50 ÷ 2 = 25. Thus the matching rule is a_1 = 100 and a_(n+1) = a_n/2, which is option C. A doubles, B has the wrong initial term, and D does not give 25 after 50.

Related tags

Recursive-RuleGeometric-SequenceHalvingIdentify-RuleMathematicsRecursive RuleSequences And ProgressionsClass 9 Mcq

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