In a certain animal population, for each of the first 3
months of life, the probability that an animal will die
during that month is 1/10 . For a group of 200 newborn
members of the population, approximately how many
would be expected to survive the first 3 months of
life?

(A) 140
(B) 146
(C) 152
(D) 162
(E) 170

ans : 'b'

explain pls