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Find Combinations without repetition of {a, b, c, d}

Solution:
Your problem `->` Combinations without repetition of {a, b, c, d}


`n=4,r=4,"List variables"=a, b, c, d`

Combination without repetition :
Formula ` = (n!) / (r! (n-r)!) = (4!) / (4! * (4-4)!)= (4!) / (4! * 0!) = 1`

List are (total = 1) :
{a, b, c, d}





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