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If two integers x, y (x>y) are selected from -10 to 9 (in

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If two integers x, y (x>y) are selected from -10 to 9 (in

by Max@Math Revolution » Tue Feb 09, 2016 5:18 pm
If two integers x, y (x>y) are selected from -10 to 9 (inclusive), how many possible cases are there?

A. 150
B. 180
C. 190
D. 210
E. 240


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by Max@Math Revolution » Sat Feb 13, 2016 9:39 pm
If two integers x, y (x>y) are selected from -10 to 9 (inclusive), how many possible cases are there?

A. 150 B. 180 C. 190 D. 210 E. 240

--> 20C2=20*19/2=190.
Therefore, the answer is C.
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