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ram
Joined: 07 Oct 2007
Posts: 7
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 Posted: Wed Jun 25, 2008 6:54 pm Post subject: numbers or permutations |
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how many 3 digit numbers have the sum of their digits as an odd number?
pls explain answer. |
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amar_javvaji
Joined: 15 Jul 2008
Posts: 2
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| Posted: Tue Jul 15, 2008 12:41 pm Post subject: |
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sum of two digits can be odd or even
from 00 to 99 u will find 50 even and 50 odd numbers.
00 even
01 odd
02 even
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10 odd
11 even
like wise every 100 numbers will have 50 odd and 50 even
so from 100 to 999 u will find 450 such numbers |
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