Questions
Let X = {1, 2, 3, 4, 5}. The number of different ordered pairs (Y, Z) that can be formed such that
and is empty is
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a
25
b
53
c
52
d
35
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Correct option is D
For each x ∈ X, we have three choices 5x ∈ Y, x∉Z , x∈Z ; x∉Y , x∉ZSo the required number of ordered pairs is 35
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