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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


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