Question

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Answer 1

hey will you be my friend

Answer 2

See Explanation

Explanation:

(a): Empty set. Odd numbers are not divisible by 2.

(b): Empty set. The most days of a month are 31.

(c): Empty set. There are only 4 vertices in a quadrilateral.

(d): 2. 2 is the only prime number that is even.