Answers

The Brainliest Answer!
2015-12-23T19:53:58+05:30
NOTE*: I'll use (int.) for intersection since I dont know the maths formatting used . Comment if you know .

Answer :

n(A U B) = n(A)+n(B) - n(A int. B)
=> 70 = n(A)+3x+8 - x - 4 = n(A)+2x+4
=> n(A) = 70 - 2x-4 = 66-2x

n(A-B)=n(A)-n(A int. B)
=> 4x-8 = 66-2x-x-4 = 62-3x
=> 7x = 70
=> x = 10

n(A' int. B) = n(B-A) = n(B) - n(A int. B)
= 3x+8 - x - 4 = 2x + 4

since x = 10

Therefore n(A' int. B) = 2x + 4 = 20 + 4 = 24
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