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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?
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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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