Divisible By 9?
Level
pending
A number k is a number followed by 12 zeroes. What is the probability k is divisible by 9?
2/3
1/9
1/3
1
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1 solution
A number is divisible by nine if it's digit sum is a multiple of nine. Because the zeros don't count for anything, the question is just asking what fraction of all numbers are divisible by 9. Obviously, 1/9.