Asked by sandy
How many three digits codes (single digits 0-9) are possible part A is codes must exceed value of 400 i think answer is 400 multiply 10 multiply 400 or 400x400x400 as three digits
Answers
Answered by
Reiny
since the code > 400, your choice for the first digit is 6,
you can put 10 different digits in the 2nd spot, and 10 different digits in the 3rd spot
number of possible codes
= 6x10x10 = 600
this would include 400, which cannot be used, since it must be greater than 400
so we have 599 different codes
you can put 10 different digits in the 2nd spot, and 10 different digits in the 3rd spot
number of possible codes
= 6x10x10 = 600
this would include 400, which cannot be used, since it must be greater than 400
so we have 599 different codes
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