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  4. The number of six digit numbers which have sum of their digits as an odd integer, is

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Q. The number of six digit numbers which have sum of their digits as an odd integer, is

Permutations and Combinations

Solution:

For the first place we have nine choices. For each of the next four places, we have 10 choices. At this stage we add the numbers already selected and choose the digit at unit’s place in 5 ways.