Q.

Number of different 6 digit numbers whose sum of digits to be odd is (repetitions are allowed)

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a

45×104

b

45

c

45×103

d

103

answer is A.

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Detailed Solution

No of numbers 6 digits numbers=9×105 ∴  Number of different 6 digit numbers whose sum of digits to be odd is =9×1052=104×45
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Number of different 6 digit numbers whose sum of digits to be odd is (repetitions are allowed)