Book Maths Puzzle Numerical Ability Algebra

How many 7 digit numbers are there the sum of whose digits are odd?

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Book Other Question

In a Shirt factory, there are three processes named A,B, and C.They manufactures 25%,35%,40% of production respectively.of these 3%,4%,2% are defective.What is the probability the randomly selected shirt is of the defective one produced by process C? How many numbers smaller then 2*10^8 and are divisible by 3 can be written by means if the digits 0,1 and 2 (exclude single digit and double digit numbers)?