Question

x,y,z are consecutive positive integers, such that x < y < z. If the units' digit of x2 is 4 and the units' digit of y2 is 1, what is the units' digit of z2?

Answer 1

unit digit of x2 is 4 and y2 is 1. So if x=8 then x2 is 64, so unit digit 4 and so y=9, which also holds true. hence z is 10,so unit digit of z2 is 0.

Answer 2

'0' that is x=8,y=9,z=10