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Question

If X={8n7n1| n ϵ N} and Y={49n49| n ϵ N}, then


A
XY
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B
YX
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C
X=Y
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D
XY=ϕ
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Solution

The correct option is A XY
If X={8n7n1|n ϵ N}={0,49,490,....}
Y={49n49|n ϵ N}={0,49,98,147,....,490,...}
Clearly, every element of X is in Y but every element of Y is not in X.
XY

Mathematics

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