TestMagic Forums - View Single Post - Is n-1 divisible by 3?

zapped · 2009 February 27th, 10:29 PM

if we chose n=-1 then (1) = -1(-1+1) = -1 which is not divisible by 3.
If i take n-1, then n-1=-1-1= -2 which is not divisible by 3.
However, if I take n=1, then 1(1+1)= 2 (not divisible by3), but n-1= 0 which is divisible. So, I kindda agree with the OG solution. (n-1), n and n+1 should be positive integers for the conditions to satisfy.
Let me know if I misinterpreted something here.

2009 February 27th, 10:29 PM	#10 (permalink)
zapped Within my grasp! Join Date: Apr 2008 Posts: 243	if we chose n=-1 then (1) = -1(-1+1) = -1 which is not divisible by 3. If i take n-1, then n-1=-1-1= -2 which is not divisible by 3. However, if I take n=1, then 1(1+1)= 2 (not divisible by3), but n-1= 0 which is divisible. So, I kindda agree with the OG solution. (n-1), n and n+1 should be positive integers for the conditions to satisfy. Let me know if I misinterpreted something here.