3 years ago

Please help with the this give tiny explanation

Mathematics

1 answer:

Mila [183]3 years ago

5 0

Answer:

first we begin from 1 to 100 we find 11 numbers contain 1 then we count 1s from 10 to 19 we get 9 numbers but there is an exciption in number 11 as it cotains 2 1s so thenumber of 1s is 21

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