Two unbiased coins are tossed simultaneously find the probability of getting
(i) two heads (ii) one head (iii) at least one head (iv) at most one head .

Explanation

S = {H H ,H T, T H, T T}
(i) Probability of two heads `=(1)/(4)`
(ii) Probability of one head ` =(1)/(2)`
(iii) Probability of at least head ` = (3)/(4)`
(iv) Probability of at most one head ` = (3)/(4)`