Probability means possibility. It is a branch of mathematics that deals with the occurrence of a random event. The value is expressed from zero to one.
From the question it is given that,
A coin is tossed times, so total number of trials is
.
Let us assume that, and
be the events of the coin,
So, total number of times A1 occurs = and the total number of times A2 occurs =
Then,
=
=
=
=