Grade 12Discuss with colleagues and IITians
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?
1 Answer
Deepak Kumar Shringi
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
one digit only one number =7
two digit 16,61,25,52,43,34
three digit ..
..
..
eight digit
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