book Maths Puzzle Numerical Ability

Can you please tell me how to find a geometric formula for finding the number of lines that can be formed in a given number of pts.?example:Given 6 points, how many lines can be fo

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book Other Question

Find all the values of x from the following equation:

30/2x+1 minus 8/x-1 + 2=0 my questions please send a.s.a.p.
1) Is every squar a rectangle? true or false

2) Is every parallelogram a quadrilateral?

3) Is every rhombus a rectangle?

4) Is every p