Answer
The number of elements in set A or set C = 28
Work Step by Step
From the given Venn diagram,
the regions I, II, IV, V. VI. VII belongs to set A or set C.
It's given from the Venn diagram that,
The number of elements belongs to region I = 5
The number of elements belongs to region II = 1
The number of elements belongs to region IV = 2
The number of elements belongs to region V = 7
The number of elements belongs to region VI = 3
The number of elements belongs to region VII = 10
Therefore the number of elements in set A or set C = 5 + 1 + 2 + 7 + 3 + 10 = 28.
