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Among (22) points (9) points are collinear and another (6) points are collinear on a different line. No other (3) points are collinear. How many lines can be formed?

Answer and explanation

Correct answer: (182)

Total pairs are (\binom{22}{2}=231). Replacing (\binom{9}{2}) and (\binom{6}{2}) by (1), (1) for collinear groups gives (182).

Related tags

CombinationsClass11HardPermutations And CombinationsMathematicsClass 11 Mcq

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