1. Good post? |

## Og 11 #146

Is n an integer?

1.) n2 is an integer
2.) sqaure root of n is an integer

2. Good post? |
1) n^2 is an int.
so n^2 can be any int 2,3,4,5,6 and not necessarily a perfect square.
if n^2=5, then n is not an int
if n^2=4, then n is an int.

2) sqrt n = an int
so n would be an int.
IMO B

3. Good post? |
Agreed
1) Is insufficient by plugging in numbers:
if n^2 = 4 -> n = 2
but n^2 = 3 -> n = fractional
INSUFFICIENT

2) if sqrt n = integer, squaring the sqrt n will yield an integer
SUFFICIENT

hence B

4. Good post? |
Agree with Genius.
The same line of reasoning.

5. Good post? |
[quote=genius_in_the_gene;761360]1) n^2 is an int.
so n^2 can be any int 2,3,4,5,6 and not necessarily a perfect square.
if n^2=5, then n is not an int
if n^2=4, then n is an int.

Thanks all.. it was silly miss from my side...!!!

6. Good post? |
easy one its B

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