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If X={4^n-3n-1:n in NN}andY={9(n-1):n in...

If `X={4^n-3n-1:n in NN}andY={9(n-1):n in NN}`
where `NN` is the set of natural numbers, then `X cupY` is equal to__

A

Y - X

B

X

C

Y

D

`NN`

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