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

Your problem `->` permutations without repetition of {a, b, c, d}

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

Permutation without repetition :
Formula ` = (n!) / ((n-r)!) = (4!) / ((4-4)!) = (4!) / (0!) = 24`

List are (total = 24) :
{a, b, c, d}, {a, b, d, c}, {a, c, b, d}, {a, c, d, b}, {a, d, b, c}, {a, d, c, b}, { b,a, c, d}, { b,a, d, c}, { b, c,a, d}, { b, c, d,a}, { b, d,a, c}, { b, d, c,a}, { c,a, b, d}, { c,a, d, b}, { c, b,a, d}, { c, b, d,a}, { c, d,a, b}, { c, d, b,a}, { d,a, b, c}, { d,a, c, b}, { d, b,a, c}, { d, b, c,a}, { d, c,a, b}, { d, c, b,a}

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