If a quotient times the dividend is 1 and the quotient is 1, what is the divisor?

Incorrect.
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If you __Reverse PI__ 5 as the divisor, $$1\div5$$ is not 1. Eliminate this one and move on.

Incorrect.
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If you __Reverse PI__ 4 as the divisor, $$1\div4$$ is not 1. Eliminate this one and move on.

Incorrect.
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If you __Reverse PI__ 3 as the divisor, $$1\div3$$ is not 1. Eliminate this one and move on.

Incorrect.
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If you __Reverse PI__ 2 as the divisor, $$1\div2$$ is not 1. Eliminate this one and move on.

Correct.
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If you __Reverse PI__ 1 as the divisor, $$1\div 1=1$$.

5

4

3

2

1