Originally Posted by

**cjh824** Hey,

Just having a problem with one question:

A man drives to work the same way every day. There are two sets of traffic lights. The prob. of stopping at the first light is .35, the prob. of stopping at the second light is .65, and the prob. of stopping at at least one light is .70.

a) Find prob. of stopping at both (I got that... 0.30)

b) Find the prob of stopping at the first but not the second

c) Find the prob of stopping at exactly one light.

Just confused about the last two. I have a small idea, but any help would be super appreciated!!

Thanks,

Craig.