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21.

Consider the following Venn diagram, where X, Y and Z are three sets. Let the number of elements in z be denoted by n(Z) which is equal to 90

If the number of elements in Y and Z are in the ratio 4 : 5, then what is the value of b ?

22.

Consider the proper subsets of {1, 2, 3, 4). How many of these subsets are superset of the set {3} ?