Question

Step 3. Determine what operations to be used.
Using the formula n( A UB ) = n(A) + n(B) – n( A n B).
then,
n(AB) = n(A) + n(B) - n(AUB)
n(ANB) = 20 + 28 - 36
n(ANB) = 48 - 36
n(ANB) = 12
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Answer 1

Answer:

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