If the probability of rain on any given day in Chicago during the summer is 25%, independent of what happens on any other day, what is the probability of having exactly 3 rainy days from July 4 through July 7 inclusive?	Options:	A) 1/16	B) 3/32	C) 5/32	D) 3/64	E) 7/64
One possible case is: rainy-rainy-rainy-not rainy.   The probability of this case is 1/4*1/4*1/4*3/4 = 3/256   The number of possible cases is 4C3 = 4.   P(exactly 3 rainy days) = 4*3/256 = 3/64   The answer is 3/64.
<result>D</result>
If the probability of rain on any given day in Chicago during the summer is 25%, independent of what happens on any other day, what is the probability of having exactly 3 rainy days from July 4 through July 7 inclusive?