Question

Two coins r tossed simultaneously write the sample space also write the events in set form and the number of sample points in each event (1)condition for event A:to get atmost one tail

Answer 1

The possible combinations.

(Head,tail)
(tail,head)
(head,head)
(tail,tail)

So there are 2 conditions where we get atmost once tail that is 1st and 2nd.
Atmost means not more than the given value.