Of 7 kittens in a litter, 4 have stripes. Three kittens are picked at random. Find the odds of each event.
1) All three have stripes.
2) Only 1 has stripes.
3) One is not striped.
I am just...utterly stuck. I tried doing 4 CR 3/7 CR 4 for the first one, but that's apparently not correct..