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2014-07-03T16:04:38+05:30

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You must have a idea of permutations to do this sum 
the odd numbers are 1,3,5,7,9
1)So putting  1 at hundreds place s the remaining tens and units place can be filled by two numbers from 6 numbers in ⁴P₂ ways = 4 × 3 =  12 ways
2)So putting  3 at hundreds place s the remaining tens and units place can be filled by two numbers from 6 numbers in ⁴P₂ ways = 4 × 3 =  12 ways
3)So putting  5 at hundreds place s the remaining tens and units place can be filled by two numbers from 6 numbers in ⁴P₂ ways = 4 × 3 =  12 ways
4)So putting  7 at hundreds place s the remaining tens and units place can be filled by two numbers from 6 numbers in ⁴P₂ ways = 4 × 3 =  12 ways
5)So putting  9 at hundreds place s the remaining tens and units place can be filled by two numbers from 6 numbers in ⁴P₂ ways = 4 × 3 =  12 ways
so adding 12 +12 +12 +12 +12 = 60 ways 
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