How many 9-digit numbers have an even sum of their digits?

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4 Answers

100 000 000 , 100 000 001 ... 999 999 999

9 hundred million numbers, half of the have even sums, so

450 million numbers
by Level 5 User (12.9k points)
How many 20-digit numbers are such that the sum of their digits is even?
by
It is 4.5*10^19
by
4.5E19 on calc
by

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