Orderless choice of 2 objects from n objects
We know that the number of ways of choosing two items from n items is given by nC2
We can look at the choice problem as in the diagram below.
Each node in the tree is representative of a choice of two items. Therefore total number of choices is equal to the
number of nodes in the above tree.
Total number of nodes is
1+2+3+4......(n−1) = n(n−1)2 = nC2
Similar analysis and derivation could be done for nC3 and nCr
RP
info@softanalytics.net
We know that the number of ways of choosing two items from n items is given by nC2
We can look at the choice problem as in the diagram below.
1+2+3+4......(n−1) = n(n−1)2 = nC2
Similar analysis and derivation could be done for nC3 and nCr
RP
info@softanalytics.net
nice work rakesh!
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