English, asked by armyblink61, 9 days ago

maths.. Algebra...sets

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Answered by sumeetdhobale

1

Answer:

n(AuB)=n(A) + n(B) - n(AnB)

70= (40-X) + (50-X) - X

70= (90-2X) - X

70 = 90 - X

X = 90 - 70

X = 20

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