Integers - PSAT Math

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Question

Which set represents all the single-digits integers (0-9) that are either prime, a perfect square, or found in the number 68?

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Answer

The prime digits are 2, 3, 5, and 7.

The perfect square digits are 0, 1, 4, and 9.

The only digits not represent in these two groups are 6 and 8, which are, coincidentally, found in the number 68.

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