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Chapter 13: Q. 3. (page 868)

IfnA=12,nA鈭�B=30,andnA鈭�B=6, findnB.

Short Answer

Expert verified

The final answer is24.

Step by step solution

01

Step 1. Given information.

nA=12nA鈭�B=30nA鈭�B=6

02

Step 2. Find nB.

To find we apply the counting formula.

That is,

nA鈭�B=n(A)+n(B)-n(A鈭�B)

So,

n(B)=n(A鈭�B)+nA鈭�B-n(A)=30+6-12=36-12=24

Thus n(B) =24.

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