One DS from new oriental tests

nina

Section 20. Q19
Is n an integer?
1. n^2 is an integer.
2. 2 sqare is an integer.

The key is B. However, I choose D. Because if n^2 is an integer, n must be an integer. Is it right? If choice B is right, please give me some example.

Thanks.

freebenben

Answer is B. example: if n=the square root of 3, than the square of n is 3, an integer.

nina

Thanks for your quick response. got it. good luck