1.
Directions for the following two questions:Let S be the set of all pairs (i, j) where 1
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By: anil on 05 May 2019 02.29 am
Any ordered pair has 2 elements => There are n-2 elements that are not present in the ordered pair. The number of enemies of any ordered pair is all the ordered pairs in the set formed using the numbers other than these two elements = $$^{n-2}C_2$$ = $$1/2 * (n^2 - 5n + 6)$$.
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