a) Evaluate each. 10! 2. 3! 7! 5! 3. Р(5, 3) 4. Р(6, 6) 1. 4! b) true or false, where n is an arbitrary nonnegative integer and 0 < r < n. Pп, 1) — Рiп,п - 1)

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Q: & 18) Vaing showj that the idently in

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Q: 20.) Prove that {9" :n€ Q} = {3" : ne Q}. %3D

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Q: (a) For integers a, b, q, r, prove that if a = bq + r then (a, b) = (b, r).

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