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Chapter 13: Q 12. (page 847)

If nA=30,nB=40,nA鈭�B=45, find nA鈭�B.

Short Answer

Expert verified

nA鈭�B=25.

Step by step solution

01

Step 1. Given Information.

The given values are

nA=30,nB=40,nA鈭�B=45.

02

Step 2. Value of nA∩B.

Using the Counting principle, we get

nA鈭�B=nA+nB-nA鈭�B45=30+40-nA鈭�B45=70-nA鈭�B-25=-nA鈭�BnA鈭�B=25.

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