Book Maths Puzzle Numerical Ability Number System

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)?

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Book Other Question

How many 7 digit numbers are there the sum of whose digits are odd?
Six white and six black balls of the same size are distributed among tens urns so that there is atleast one ball in each urns.what is the number of different distribution of the balls?
a)25000
b)26250
c)28250
d)13125