In a test involving yes/no answers, the probability that the official answer is correct is t, the probability of getting the real correct answer is b for a boy and g for a girl. If the probability that a randomly chosen boy or girl of getting the official answer to a question is 1/2, then [...]
Archive for October, 2014
Find all solutions in positive integers a, b, c to the equation
a! b! = a! + b! + c!