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October 16th, 2011, 02:46 AM   #1
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What is the method?

How many times 5 is present when we write all natural numbers to 1000 ?

what is the method of solving it.??
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October 16th, 2011, 04:03 AM   #2
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Re: What is the method?

The same number of fives as 0 to 999. Write 0 like 000, 1 like 001 etc so every number has 3 digits.
Now, there is A total of 3 * 1000 = 3000 digits, of which 10% = 300 are 5.
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October 16th, 2011, 04:48 AM   #3
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There are 300 fives: 100 as the hundreds digit, 100 as the tens digit and 100 as the units digit. How many ones are there?
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