9. If U = {3, 4, 5, 6, 7, 8, 9, X = {3,4}, Y = {5,67
and Z = {7,8,9}, then Y'(XnZ)' is equal to
(a) XUY (b) YUZ (c) (X UZ)' (d) X'Y'
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cc
Step-by-step explanation:cc
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