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isaiahromero15
04.02.2020 •
Mathematics
Apositive integer is subtracted from its square. the units digit of the result could be which of the following?
a. 3
b. 4
c. 5
d. 6
e. 7
Solved
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Ответ:
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.
Ответ: