II ak (d) ak bk assuming that b k%3D1 k=1 4.6.11. Prove the following identities. n + 2 (a) %3D2- 22 (for n > 1). 2n i=1 п(Зп — 1) - (b) (3і - 2) — (for n > 1). 2 i=1 n+1 (e) II (1 (for n 2 2). 2n i=2...

4.6.11 Parts b and c

Extracted text: II ak (d) ak bk assuming that b k%3D1 k=1 4.6.11. Prove the following identities. n + 2 (a) %3D2- 22 (for n > 1). 2n i=1 п(Зп — 1) - (b) (3і - 2) — (for n > 1). 2 i=1 n+1 (e) II (1 (for n 2 2). 2n i=2 4.6.12. Let P(1), P(2), ... be a sequence of statements. Wi page 92), for proving that P(n) is true for... (a) all n's which are a multiple of 3.