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January 29th, 2012, 12:54 AM   #1
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No. of ways to form a number

A six-digit number is to be formed from the digits 1, 2 ,3, 4, 5, 6, 7, 8, 9. Find how many ways the six-digit number can be formed if the number must be odd and is less than 600,000 and no digit may appear more
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January 29th, 2012, 03:37 AM   #2
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Re: No. of ways to form a number

Quote:
Originally Posted by Punch
A six-digit number is to be formed from the digits 1, 2 ,3, 4, 5, 6, 7, 8, 9. Find how many ways the six-digit number can be formed if the number must be odd and is less than 600,000 and no digit may appear more
....no digit may appear more than once?

123457, 123459, ...., 598761, 598763 ; 18480
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January 29th, 2012, 04:35 AM   #3
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Re: No. of ways to form a number

Hello, Punch!

Quote:
A six-digit number is to be formed from the digits 1, 2 ,3, 4, 5, 6, 7, 8, 9.
Find how many ways a six-digit number can be formed if the number must be odd
and is less than 600,000 and no digit may appear more than once.






There are two cases to consider.






















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