Consider a function f(k) defined for all k=1,2,3........ (+ Values only)The function satisfies the condition f(1)+f(2)+...... = p/p-1where 0<1<1<1 Then f(k) is given by <1<1>

1) -p(p)^{k-1}
2) p(1-p)^{k-1}
3) [p(1-p)]^{k-1}
4) None of these