Question

If n (A) = 15, n (A È B ) = 29, n (A Ç B) = 7 then n (B) = ?​

Answer 1

Answer:

Given that

n ( a) = 15

n ( a U b ) = 29

n ( a n b) = 7

To find : n (b)

Using the formula ,

n ( a U b ) = n (a) + n (b) - n ( a n b )

29 = 15 + n (b) - 7

29 = 8 + n(b)

n ( b) = 29-8

=21

Step-by-step explanation:

Answer 2

Question:-

If n (A) = 15, n (A È B ) = 29, n (A Ç B) = 7 then n (B) = ?

Solution:-

Given that

n ( a) = 15

n ( a U b ) = 29

n ( a n b) = 7

To find : n (b)

Using the formula ,

n ( a U b ) = n (a) + n (b) - n ( a n b )

29 = 15 + n (b) - 7

29 = 8 + n(b)

n ( b) = 29-8

=21