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16 Jun 2019, 23:19
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E
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
65%
(hard)
Question Stats:
52% (01:53) correct
48%
(02:28)
wrong
based on 83
sessions
History
Date
Time
Result
Not Attempted Yet
How many rectangles can be formed by connecting the grid points from the figure above? (Diagonal connection of grid points is not permitted)
table 1.jpg [ 10.12 KiB | Viewed 4207 times ]
A. 72
B. 96
C. 108
D. 192
E. 315
Attachment:
table 1.jpg [ 10.12 KiB | Viewed 4207 times ]
A. 72
B. 96
C. 108
D. 192
E. 315
17 Jun 2019, 03:37
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MathRevolution
There are 7 vertical lines and 6 horizontal lines..
We require TWO of each to form a rectangle. 7C2*6C2=21*15=315
E
17 Jun 2019, 16:17
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chetan2u
Hello chetan2u!
I knew I had to do it like that, but my mistake was:
24C2
Why is it wrong with that?
Kind regards!
