
#1
Aug1710, 11:04 PM

P: 1

How many times will the number 3 appear in counting numbers from 1 to 1000?
PS: Just joined the forums. 



#2
Aug1810, 05:44 AM

P: 313

Hi there,
I'm not sure if it's really statistics, and it sounds a bit like a homework question... Here's a hint: there's 1 3 in the units digit in every nnn0..nnn9 there's 10 3s in the tens digit in ever nn00..nn99 etc.... Mathematica can construct all of the digits and count the number of 3s using Count[Flatten[IntegerDigits/@Range[1000]], 3] 


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