MCQ
Ifn ∈ N, then the highest positive integerwhich dividesn(n – 1)(n – 2) is:
- A3
- B6
- ✓9
- D12
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. . . .and $Y$ be set consisting of the first $2018$ terms of the arithmetic progression $9, 16, 23$,. . . . . Then, the number of elements in the set $X \cup Y$ is. . . .