Question

Two coins are tossed together . What is the probability of getting :
1) at least one head ?
2) both heads or both tails ?

Answer 1

Solution-: When two coins are tossed , then possible outcomes are : HH ; HT ; TT ; TH
So total outcomes = 4
The outcomes in which one or more head occurs are : ​HT ; HH ; TH

No. of favorable outcomes =3
1)Therefore, probability of atleast one head= $\frac{3}{4}$
2) Now, double head = 1 and double tail =1
So probability of 2 heads or 2 tails = $\frac{2}{4}$= $\frac{1}{2}$