Albinism in a Human family, Geneticist help please!! until 11:59 :?

http://session.masteringgenetics.com/problemAsset/1511921/6/Sand.ch2.p15.jpg
Part C
The female I-1 and her mate, male I-2, had four children, one of whom has albinism. What is the probability that they could have had a total of four children with any other outcome except one child with albinism and three with normal pigmentation?
Express your answer using three decimal places.

Part D is shown after C is completed only have one attempt remaing on

Post Merge: 11 years ago

exclude part C figured out using binomial probability.. For Part D What is the probability that female I-3 is a heterozygous carrier of the allele for albinism? Express your answer using three decimal places. answer cannot be 1/2 or 3/4