Two coins are tossed simultaneously. Find the probability of getting
(i) at least one head.
(ii) head on both the coins.

Explanation

Let S be the smape space
Then `S={HH, HT, TH, T T}.`
(i) Let A be the event where at least one heat turns up
Then `A={HH, HT, TH}" "thereforen(A)=3`
`P(A)=(n(A))/(n(S))" " thereforeP(A)=3/4`
The probability is `3/4.`
Let B be the event of getting head on both the coins.
Then `B={HH} " "n(B)=1`
`P(B)=(n(B))/(n(S))" "thereforeP(B)=1/4`
The probability is `1/4.`