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Consider a,b,c,d, List all combination t...

Consider a,b,c,d, List all combination taken 3 at a time.

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The list includes abc, abd, acd, bcd.
Here, abc,bca,cab are regarded the same as order is not important.
The number of combination of n things taken r at a time is denoted by `.^(n)C_(r)`.
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