Let p: The whole number has one digit.Let q: The whole number is less than 10.Which represents "The whole number has one digit if and only if the whole number is less than 10”?

“If and only if” is represented by the biconditional symbol ↔. Here p means the whole number has one digit, and q means it is less than 10, so the statement is p ↔ q. Choice D, p ↔ q, is correct.

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