Answer
The number of elements in set B = 17.
Work Step by Step
From the given Venn diagram,
the regions II, III, V, VI belongs to set B.
It's given from the Venn diagram that:
The number of elements belongs to region II = 1
The number of elements belongs to region III = 6
The number of elements belongs to region IV = 7
The number of elements belongs to region VI = 3
Therefor The number of elements in set B = 1 + 6 + 7 + 3 = 17.
