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05 May 2020, 04:57
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A
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
95%
(hard)
Question Stats:
27% (01:52) correct
73%
(01:58)
wrong
based on 79
sessions
History
Date
Time
Result
Not Attempted Yet
How many points (x y), where x and y are integers, lie inside of the triangular region with vertices (0, 0), (0, 31), and (31, 0) ?
A. 435
B. 450
C. 464
D. 465
E. 466
Are You Up For the Challenge: 700 Level Questions
A. 435
B. 450
C. 464
D. 465
E. 466
Are You Up For the Challenge: 700 Level Questions
05 May 2020, 07:46
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Bunuel
The step-by-step solution to this HARD problem is explained well in Video
Answer: Option A
Attachments
Screenshot 2020-05-05 at 8.14.18 PM.png [ 821.43 KiB | Viewed 5962 times ]
General Discussion
05 May 2020, 06:53
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Mapping the co-ordinates will give a right-angled triangle in the I quadrant.
Since we need to calculate the points inside the triangle, the base will be of length 31-1-1 = 29.
Next line will have 28 points, 27 and so on.
Total points = 29*30/2 = 435.
A is the answer.
Since we need to calculate the points inside the triangle, the base will be of length 31-1-1 = 29.
Next line will have 28 points, 27 and so on.
Total points = 29*30/2 = 435.
A is the answer.
