if the probability of rain on any given day in chicago during the summer is 50 % , independent of what happens on any other day , what is the probability of having exactly 3 rainy days from july 4 through july 8 , inclusive ?
"from july 4 to july 8 , we have total of 5 days . prob of raining on exactly 3 days = 5 c 3 ∗ ( 1 / 2 ) 3 ∗ ( 1 / 2 ) 25 c 3 ∗ ( 1 / 2 ) 3 ∗ ( 1 / 2 ) 2 = 5 / 16 ans : c"
multiply(4, power(divide(const_1, const_2), 4))