Answer
Total number of proper subsets are = 64 - 1 = 63
Work Step by Step
{2,4,6,8,10,12}
A set of n elements have 2^{n} number of subsets.
Here set has 6 elements. So total number of subsets are 2^{6}=64.
As these 64 subsets also include the one subset which is the set itself. We need to exclude this one subset.
Thus Total number of proper subsets are = 64 - 1 = 63.
