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1. Jeff owns 1 red shirt, 4 blue shirts, 5 white shirts, and 3 black shirts. He randomly selects four shirts to pack for vacation.

a) What is the probability he packs all white shirts?

b) What is the probability he packs the red shirt?

c) What is the probability he packs at least one blue shirt?

2. For the month of January in Cincinnati, 83.9% of the days are 32° F or below. Also in the month of January in Cincinnati, 23.2% of the days are 32° F or below and snowy. What is the probability a randomly selected day in January in Cincinnati will be snowy if it is 32° F or below?

I'm racking my brain on these, for some reason probability questions just are clicking for me.

I think the second one is setup .232/.869=.266