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NEERAJA P M

· started a discussion

· 1 Months ago

q.15 permutation and combination (Question:584786.0)

Please give explanation

Question:
If 7 parallel lines are intersected by another set of 7 parallel lines, the number of parallelograms formed is equal to:
Options:
A) 441
B) 400
C) 49
D) 98
Solution:
Required number of parallelogram = 7c2 x 7c2 = \(7\times6\times7\times6\over2\times2\)  = 21 x 21 = 441

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