Permutations Practice Test 1

Question : 25 of 40

Marks: +1, -0

Out of 18 points in a plane, no three are in the same straight line except five points which are collinear. The number of straight lines that can be formed joining them is:

143
144
153
None of these

Validate

Solution:

The number of st. lines

=^18C_2 = (^5C_2 - 1) = 144

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