Question: 1 1 2. Prove 1++ 2 4 1 2 +...+ 2 1 for all n20 . 2 3. Prove (11) - 4 is divisible

1 1 2. Prove 1++ 2 4 1 2 +...+ 2" 1

1 1 2. Prove 1++ 2 4 1 2 +...+ 2" 1 for all n20 . 2" 3. Prove (11)" - 4" is divisible by 7 when n is a positive integer. n (n+1) 4. Prove 1+2 +3 +...+n for all positive integers. %3D 4

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