Amaddyoshales Amaddyoshales

08-11-2016
Mathematics

Answered

A positive integer is subtracted from its square. The units digit of the result could be which of the following?

A3
B4
C5
D6
E7

Verified Answer :

alsteva alsteva

11-11-2016

Correct answer is D.

Look at the unit digit of a number, and ignore the other digits. We will denote other digits with dots (......). Let's say we have a number .....3.

......3^2 - 3 = ......9 - 3 = ........6

Check for numbers which unit digit is 1,2,4,5,6,7,8,or 9. They don't satisfy any of the answer options.

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