Toss a coin twice and let p be the probability of a head appearing on a single toss (0 (a) both tosses come up heads, given that at least one toss comes up heads. (b) both tosses come up heads, given...

Toss a coin twice and let p be the probability of a head appearing on a single toss (0 <><>

(a) both tosses come up heads, given that at least one toss comes up heads.

(b) both tosses come up heads, given that the first toss comes up heads. Can the probabilities in (a) and (b) ever be the same?