Question

if n is a natural no then n(n+1) is always
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a) odd no
b) divisible by 2
c) divisible by 3
d) prime no​

Answer 1

Answer:

(b) and (c) Both are correct

Example : -

Let ,

n = 3

3(3+1)

3×4 = 12 { divisible by both 2 and 3 but not an odd number .}

Let another number,

n =9

9(9+1)

9×10 = 90 { divisible by both 2 and 3 but not an odd number .}