Step 1. Determine what is given and what are being asked.
Given :
n(A) = 20,
n(B) = 28
n( A U B ) = 36.
Asked:
Find n( A N B).
Step 2. Illustrate using Venn diagram if possible
The Venn diagram is shown below
U
A ANB B
Step 3. Determine what operations to be used.
Using the formula n( A U B ) = n(A) - n( A N B ). then ,
n( A N B ) = n(A) + n(B) - n( A U B )
n( A N B ) = 20 + 28 - 36
n( A N B ) = 48 - 36
n( A N B ) = 12
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