If 3x−y=12, what is the value of 8x/2y ? A) 212 B) 44 C) 82 D) The value cannot be determined from the information given.
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You only need to consider the situations where 10 or 11 of the babies are girls, then subtract those probabilities from 1. This will give probability that any other number up to 9 of the babies are girls.
Use binomial theorem.
n = 11
k = 10,11
p = 1/2
Use binomial theorem.
n = 11
k = 10,11
p = 1/2