Explain why each of the following numbers is composite.
a. 7 ‧ 11 ‧ 13 ‧ 17 + 17
b. 10! + k where k = 2, 3,4, 5, 6, 7, 8, 9, or 10 (Note: 10! = 10 ‧ 9 ‧ 8 ‧ 7 ‧ 6 ‧ 5 ‧ 4 ‧ 3 ‧ 2 ‧ 1.)
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