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OpenStudy (anonymous):
How Many no. Between 1000 to 9900 in which four digits of number are different
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OpenStudy (acxbox22):
you can start counting
OpenStudy (anonymous):
ha ha
OpenStudy (acxbox22):
jk, sorry cant help with this one
OpenStudy (wolf1728):
When you say different - do you mean have no repeated digits?
OpenStudy (wolf1728):
I think you are asking for derangements. http://en.wikipedia.org/wiki/Derangement
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OpenStudy (anonymous):
8900
OpenStudy (anonymous):
Number of 4 digit numbers having all different digits = 9*9*8*7 = 4536 smallest number : 1234, largest number : 9876, all are between 1000 and 9900. ans: 4536
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