Question

3) If n(A) = 7, n(B) = 13, n(An B) = 4, then n(A u B ) =?​

Answer 1

Answer:

16

Step-by-step explanation:

n(A) = 7, n(B) = 13, n(A∩B) = 4

n(A∪B) = n(A) + n(B) + n(A∩B)

=7 + 13 - 4=16

Answer 2

Answer:

16

Step-by-step explanation:

Given,

n(A) = 7

n(B) = 13

n(A n B) = 4

Then, n(A u B) = n(A) + n(B) - n(A n B)

= 7 + 13 - 4

= 20 - 4

= 16