Suppose that a family wants to have four children. (enter the probabilities as fractions.)
(a) what is the sample space? (let b represent a boy and g represent a girl. to indicate that the first child is a boy, the second child is a boy, the third child is a boy, and the fourth child is a girl enter bbbg. enter your answers as a comma-separated list.)

what is the probability of 1 girl and 3 boys?

& & 2 boys and 2 girls ? ?