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Mathematics
Combinations and Permutations
Codes and number arrangements
if there is a 4 digit code and the number choices are 0-9 and the last two numbers in the code are 0 and 7 what are all the code possibilites?
_ _ 0 7
1 answer
From 0 to 9 involves 10 digits, and assuming we can start with a 0 and we can repeat a digit, the number of possible codes that end in 07 is 10x10 or 100
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