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B
Y⊂X
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C
X=Y
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D
X∩Y=ϕ
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Solution
The correct option is A
X⊂Y
If X={8n−7n−1|nϵN}={0,49,490,....} Y={49n−49|nϵN}={0,49,98,147,....,490,...} Clearly, every element of X is in Y but every element of Y is not in X. ∴X⊂Y