if the hcf of 65 and 117 is expressible in the form of 65m-117 then the value of m
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18
o form parallelogram we required a pair of line from a set of 4 lines and another pair of line from another set of 3 lines.
Required number of parallelograms = 4C2 x 3C2 = 6×3 = 18
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