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Statement-1 If U is universal set and B ...

Statement-1 If U is universal set and B = U - A, then n(B) = n(U) - n(A).
Statement-2 For any three arbitrary sets A, B and C, if C = A - B, then n(C ) = n(A) - n(B).

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The correct Answer is:
c
`because B = U - A = A'`
`therefore n(B) = n(A') = n(U) - n(A)`
So, Statement-1 is true.
But for any three arbitrary sets A, B and C, we cannot always have
n(C ) = n(A) - n(B)
if C = A - B
As it is not specified A is universal set not. In case not conclude.
n(C ) = n(A) - n(B)
Hence, Statement-2 is false.
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