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NB. with the questions involving complement, the value is recorded in the rectangular box but not in any of the two circles.
to calculate, we say:
n(U)=n(A) + n(B) - n(AnB) + n(AuB)' .
NB. n(U) is the universal set.
n(A) is the number belonging to A
n(B) is the number belonging to B
n(AnB) is the number A and B (intersection)
n(AuB)' is the number that do not belong to A or B (complement)
OR
n(U)= I + II + III + IV
where, I is the number belonging to A only
II is the number belonging to both A and B (intersection)
III is the number belonging to B only
IV is the number that do not belong to A or B.
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