Skywalker18 wrote:
What is the tens digit of the positive integer n ?
1. The hundreds digit of 10n is 2 .
2. The tens digit of n-9 is 1 .
Statement 1say n = 325. Ten's digit is 2.
10n = 3250. Here Hundred's digit is 2.
again say n = 25, Ten's digit is 2.
10n = 250. Here Hundred's digit is 2.
We will see that always we will get unique answer.
Statement 1 is sufficient.
Statement 2say n = 19, then 19-9 = 10. ten's digit of 10 is 1. ten's digit of 19 is also 1
now say n = 22, then 22-9 = 13. ten's digit of 13 is 1. BUT ten's digit of 22 is NOT 1. It is 2.
So not sufficient.
A is the answer.