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how many natural numbers less than 10^8 are there whose sum of digits equals 7?

how many natural numbers less than 10^8 are there whose sum of digits equals 7?

Grade:12

1 Answers

Deepak Kumar Shringi
askIITians Faculty 4404 Points
2 years ago
make all possible case digitwise for example
one digit only one number =7
two digit 16,61,25,52,43,34
three digit ..
..
..
eight digit

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