Question

Bag 1 contains 3 blue and 4 red balls. Bag 2 contains 2 blue and 6 red balls. Bag 3 contains 1 blue and 8 red balls. Find out the probability that bag 1 is chosen

Answer 1

$probability \: that \: bag \: one \: is \: choossen \\ p(a) = \binom{3}{4} \\ p(a) = \binom{3}{4}$