Solution:
Factors are numbers which can go into the number whose factors is being determined.
Factors of 36 are numbers that can go into 36
Factors of 36,P={1,2,3,4,6,9,12,18,36}
Multiples of 4 less than 40,Q={4,8,12,16,20,24,28,32,36}
Intersection ∩ means element you can find in both sets
P∩Q={4,12,36}
If a set contains ' n ' elements, then the number of subsets of the set is 2n.
The number of elements in P∩Q is 3 , hence the number of subsets could be calculated as:
Subsets =23=2×2×2=4×2=8
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