A sequence of numbers begins with 12 and progresses geometrically. Each number is the previous number divided by 2 Which value can be used as the common ratio in an explicit formula that represents the sequence?

In a geometric sequence, the common ratio is the factor used to multiply each term to get the next term. Dividing each number by 2 is the same as multiplying by 1/2, so the common ratio is 1/2. Therefore, the correct choice is 1 half.

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