Answer:
16 subsets
Step-by-step explanation:
To know the number of subsets that the set have, we will have to find the power of the set.
Given the set a = ( a,b,c,d)
P(a) = 2^n where;
n is the total number of element in the set
n = 4
p(a) = 2^4
P(a) = 16
Hence the set has 16 subsets