Five-digit 82257

Determine the number of all five-digit natural numbers in which every two digits are different in decimal notation.

Correct answer:

n =  27216

Step-by-step explanation:

abcde a  {19} b  {09}  {a} c  {09}  {a,b} d  {09}  {a,b,c} e  {09}  {a,b,c,d}  n=9 9 8 7 6=27216

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