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
* A solution will be posted in two days.
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 (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.
A. 150 B. 180 C. 190 D. 210 E. 240
--> 20C2=20*19/2=190.
Therefore, the answer is C.
Math Revolution
The World's Most "Complete" GMAT Math Course!
Score an excellent Q49-51 just like 70% of our students.
[Free] Full on-demand course (7 days) - 100 hours of video lessons, 490 lesson topics, and 2,000 questions.
[Course] Starting $79 for on-demand and $60 for tutoring per hour and $390 only for Live Online.
Email to : [email protected]