1.

If `n(A nn B) = 40, n(A) = 50` and `n(B) = 60`, then find `n(A DeltaB)`

Answer» `n(A uu B) = n(A) + n(B) - n(A uu B) = 50 + 60 - 40 = 70`
`n(A Delta B) = n(A uu B) - n(A nn B)`
`rArr 70 - 40 = 30`.


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