N(a)=20,n(b)=28 And n(a u b)=36 Find (a n b)
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n(AuB)=n(A)+n(B)-N(AnB)
36=20+18-x
x=2
36=20+18-x
x=2
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n(a u b) = n(a) + n( b) - n( a n b)
36. = 20+28-n(a n b)
36-48 = - n(a n b)
-12 = - n(a n b)
12 = n(a n b) .
36. = 20+28-n(a n b)
36-48 = - n(a n b)
-12 = - n(a n b)
12 = n(a n b) .
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