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lihat diagram venn...
Pembahasan
P(A∪B∪C) = (1+2+3+4+5+6+7)/56
= 28/56
= 1/2
P(A'∩B'∩C') = P( A∪B∪C)'
= P(S) - P( A∪B∪C)
= 1 - 1/2
= 1/2
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