MGMAT Advanced Quant Chapter5 Problem Set #4

[Ianjjang0123]

What is the units digit of y?
(1) The units digit of y^2 equals 6.
(2) The units digit of (y + 1)^2 equals 5.

Hello. I got an answer C for this problem because I got two values of the unit digit of y, -6 and 4, in stmt2, and four values, 4,-4,6,and -6, in stmt1, resulting the combined value of the unit digit to 4. However, the answer is E. What's is wrong with my approach?
Thank you in advance.

[tim]

First, this question is posted in the wrong forum so the topic is now locked. Please read what you wrote; *your own calculations* suggest there are two values and hence the answer is E. If you have further questions on this one, please post in the appropriate forum.