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LET A,B,C BE THREE FINITE SETS WITH k,l,m elements respectively. If B intersection C contains n elements, then the number of elements in the set A*(B U C).............
B U C = B + C - (B intersection C)
B U C = l + m -n
and A = k
so the number of elements in the set A*(B U C) :
= k ( l + m - n)
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Moderation Team
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