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Mathematics 17 Online
OpenStudy (anonymous):

A key code must contain 4 numerals. There are 10 numerals available. Using these numerals, how many different key codes may be created?

Vocaloid (vocaloid):

10 choices for each numeral, 4 numerals, so 10*10*10*10

OpenStudy (anonymous):

it says its wrong

Vocaloid (vocaloid):

well, it doesn't specify repetition, but perhaps they want 10*9*8*7?

OpenStudy (anonymous):

the answer are 210 3060 5040 180 @Vocaloid

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