3. Represent each of the following series as a telescopic series and find its value.

00 1

(a) 2: k(k + 1) .

k=l 00 (k(k+2))

(b) ~log (k+l)2 .

(c) ~ t{f (1 - (~yk) , where jk = -1/(k(k + 1)) for kEN.