If x,y and z are single digit integers and 100(x)+ 1,000(y)+10(z)=N. What is the unit's digit of the number N?
A) 0
B) 1
C) x
D) y
E) z
A) 0
B) 1
C) x
D) y
E) z
Hi RiyaR,
This is a "concept" question, meaning that you need to think about what the information "really means" to answer it. It can also be solved by TESTing VALUES.
Let's TEST:
X = 2
Y = 3
Z = 4
100(2) + 1000(3) + 10(4) = N
200 + 3000 + 40 = N
3240 = N
The question asks for the "unit's digit" (aka the "one's digit"). The unit's digit is 0
Final Answer: A
GMAT assassins aren't born, they're made,
Rich
