1.

If R &T are two finite sets and that n(R)=40, n (T)=48 and n (R U T) =56,find the n (R n T).

Answer»

N(R U T) = n(R) + n( T) - n( R n T)

=> 56 = 40 + 48 - n(R n T)

=> n(R n T) = 88-56 = 32


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