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Which recursive rule matches the sequence (72,24,8,\ldots)?

Answer and explanation

Correct answer: (a_1=72, a_{n+1}=\frac{a_n}{3})

A recursive rule must include the correct initial term as well as the operation used to produce the next term. The sequence begins with 72. Dividing 72 by 3 gives 24, and dividing 24 by 3 gives 8. Therefore each new term is one-third of the preceding term. The rule is not based on subtracting a fixed number, because the differences are 48 and 16, which are not equal.

The correct symbolic description is \(a_1=72\) and \(a_{n+1}=\frac{a_n}{3}\). This is option C. Option B uses the correct division operation but starts with 24, so it would produce 24, 8, and a later term instead of the stated sequence beginning at 72. Both the starting value and the recursive operation must match.

Related tags

Recursive-RuleIdentify-RuleDivisionClass-9

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