Question: An keypad has a 4 digit pass code from digits 0-9. Duplicated Digits arent allowed. The total amount of digits that aren't repeated are 5040.

An keypad has a 4 digit pass code from digits 0-9. Duplicated Digits arent allowed. The total amount of digits that aren't repeated are 5040. Two randomly selected people share their passcodes on the keypad. What is the probability that they share first and third digits.

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