Two coins are tossed simultaneously

Explanation
Let H is the symbol for head and T be the symbol for tails
After tossing two coins tht total outcome will be {HH,TT,HT,TH}=4
And the favourable outcome of getting at most one head is {HT,TH,TT}=3
So the probability of getting at most one head will be 3/4
Final Answer
The probability of getting at most one head is 3/4.