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In sub - part (i) to (x) choose the correct option and in sub - part (xi) to (xy), answer the questions as intructed .
If A and B are two sets that n(A-B) =10, n(B-A)=8 and `n(AcapB)=3`, them `n(AuuB)`

A

15

B

21

C

13

D

11

Text Solution

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The correct Answer is:
b
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