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There are 3 set of parallel lines containing p lines, q lines and r lines resp. The greatest no. of parallelograms that can be formed by the system _______

(a) pqr + (p-1) (q-1) (r-1)

(b) 1/4 { pqr + (p-1) (q-1) (r-1)}

(c) 1/4 pqr (p+1) (q+1) (r+1)

(d) None of these

1 Answer

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Best answer

Correct option: (d) None of these

Explanation:

Number of parallelogram

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