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  4. If X = 4n - 3n -1: n ∈ N and Y = 9(n -1): n ∈ N where N is the set of natural numbers, then X ∪ Y is equal to:

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Q. If $X = \{4^n - 3n -1 : n \in N\}$ and $Y = \{9(n -1) : n \in N\}$, where N is the set of natural numbers, then $X \cup Y$ is equal to:

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Solution:

Correct answer is (b) Y