Question

If two coins are tossed, then find the probability of the event that at least one head turns up.

Answer 1

Let S be the sample space.
Then S = {HH, HT, TH, TT}
∴ n(S) = 4
Let A be the event where at least one tail turns up.
At least one head means 1 head or more than 1 heads.
If S = {HH, HT, TH, TT}
∴ A = {HT, TH, HH}
∴ n(A) = 3
n(A) 3
Now, ` P(A)=(n(A))/(n(s))=3/4`