how many triangles are formed by joning 4 points
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I am interested what is a number of different way to form triangle from point of 44 point; on one test, I could not copy it's solution, it is said that it equals to
4!3!(4−3)!4!3!(4−3)!
but I am surprised, order of points does not matter? If three point are on the same line that no triangle could be formed, so order of points are important yes? Or it is not related to order, because order is defined as position as I know, also here the formula is
N(N−1)2.
this both can be used
4!3!(4−3)!4!3!(4−3)!
but I am surprised, order of points does not matter? If three point are on the same line that no triangle could be formed, so order of points are important yes? Or it is not related to order, because order is defined as position as I know, also here the formula is
N(N−1)2.
this both can be used
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