Try the problem
This problem of Bijection Principle is from B.Stat, B.Math Entrance.
How many natural numbers less that $ 10^8 $ are there, whose sum of digits equals 7?
Watch the first hint
Other useful links:-
Subscribe to Cheenta at Youtube
Your email address will not be published. Required fields are marked *
Comment *
Name *
Email *
Website
Δ
This site uses Akismet to reduce spam. Learn how your comment data is processed.