GMAT Quantitative Reasoning Practice Test 2

Question : 73 of 100

Marks: +1, -0

x

and

y

are positive integers

(x>y)

, what is the units' digit of

(10 x-9 y)^2

Solution:

Try some numbers,

x=2, y=1

(106-92)^2=81

. And it will work with any given number under the conditions given.

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