Answer
The number of elements in set A = 15.
Work Step by Step
From the given Venn diagram,
the regions I, II, IV, V belongs to set A.
It's given from the Venn diagram that:
The number of elements belongs to region I = 5
The number of elements belongs to region III = 6
The number of elements belongs to region IV = 2
The number of elements belongs to region V = 7
Therefor The number of elements in set A = 5 + 1 + 2 + 7 = 15.
