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19 Nov 2020, 03:15
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Difficulty:
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36% (01:27) correct
64%
(01:54)
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based on 58
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If ten parallel lines were intersected by another nine parallel lines, then how many parallelograms are formed?
A. 72
B. 1008
C. 1320
D. 1520
E. 1620
A. 72
B. 1008
C. 1320
D. 1520
E. 1620
19 Nov 2020, 04:47
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Bunuel
If ten parallel lines were intersected by another nine parallel lines, then how many parallelograms are formed?
A. 72
B. 1008
C. 1320
D. 1520
E. 1620
A. 72
B. 1008
C. 1320
D. 1520
E. 1620
total possible pairs
9c2 *8c2 ; 1008
option B
