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20 12 how to do the 23rd question of mathematics and science in Jiangsu college entrance examination, the answer is incomprehensible.
It's simple. First, substitute the value of n to find pn.

Then, according to the circle 1, all the possibilities of a set are found.

Then according to circle 2, delete the A set that does not meet this condition.

Then, according to circle 3, the group A that does not meet the requirements is screened again.

The last set left is f4.

The second question has been clearly answered. . I won't explain it.

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