1. Find explicit formulas for sequence : 0, – , , -3,5-5,5. – COIN 2. Prove that for every integer n > 1, 2+4 +6+…+2n = n2 + n. 3. Prove that for every integer n > 1, 12 +23+ + n(n+1) 2 n+1 4. Prove that for each integer n > 0, n(na +5) is divisible by 6.

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