Question 1191406
the permutation formula is:
p(n,x) = n! / (n-x)!
when n = 4 and x = 3, the formula becomes:
p(4,3) = 4! / (4-3)! = 4! / 1! = (4*3*2*1!) / 1! = (4*3*2) = 24
those permutations would be:
abc acb bac bca cab cba
abd adb bad bda dab dba
acd adc cad cda dac dca
bcd bdc cbd cdb dbc dcb