What is the second digit in 217903
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A thief steals an ATM card and must randomly guess the correct four-digit pin code from a 6-digit key keypad. Repetition of digits is allowed. What is the probability of a correct guess on the first try?
In the number which digit is estimated?
a.)
b.)
c.)
d.)
e.) None of the above
Using the digits 0, 2, 3, 7, 8, 9, how many 4-digit numbers can be formed when repetition is not allowed (digits cannot be repeated)?