Bantu jawab b sigma k=1 1 per 1< + 2 , 3 sigma k=1 2 k

jawab

a) k = 1 sd 3 --> 1/3 + 1/4 + 1/5  = 47/60

b) k = sd 3 -->  2 + 2^2 + 2^3 = 2 +4 +8 = 14