INTRODUCING 5 - days-a-week problem solving session for Math Olympiad and ISI Entrance. Learn More 
Bose Olympiad Project Round is Live now. Learn More 

February 21, 2020

Bijection Principle from I.S.I. Entrance

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?

Subscribe to Cheenta at Youtube

Leave a Reply

This site uses Akismet to reduce spam. Learn how your comment data is processed.

Cheenta. Passion for Mathematics

Advanced Mathematical Science. Taught by olympians, researchers and true masters of the subject.