WBJEE · Maths · Basic of Mathematics
For positive integer \(n, n^{3}+2 n\) is always divisible by
- A 3
- B 7
- C 5
- D 6
Answer & Solution
Correct Answer
(A) 3
Step-by-step Solution
Detailed explanation
For \(n=1,2,3\)..., we find that \(n^{3}+2 n\) takes values 3, \(12,33, \ldots,\) which are divisible by \(3 .\)
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