If 'a' is a positive integer and if the units digit of a^2 is 9 and the units digit of (a+1)^2 is 4 , what is the units digit of (a+2)^2 ?
For Quant problems, some of us just provide the answer...The new members cant help but feel lost and left behind.
please make an effort to explain ...it could be just a few lines.
I got A(1) by using number 7, 7+1, 7+2.
Is there any other way to do it ?