A coin is tossed 2n times. The chance that the number of times one gets head is not equal to the number of times one gets tails is
(2n!)(n!)2122n
1−(2n!)(n!)2
1−(2n!)(n!)214n
none of these
The required probability is
1 - Probability of getting equal number of heads and tails
=1−2nCn12n122n−n=1−(2n)!n!n!14n=1−(2n)!(n!)2×14n