Statistic Question.

by Abderrahim
Tags: statistic
Abderrahim is offline
Aug17-10, 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.
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Simon_Tyler is offline
Aug18-10, 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

Mathematica can construct all of the digits and count the number of 3s using
Count[Flatten[IntegerDigits/@Range[1000]], 3]

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