I.S.I. and C.M.I. Entrance

Bijection Principle from I.S.I. Entrance

Bijection principle is an important tool in combinatorics. This problem from I.S.I Entrance is useful for Math Olympiad. Try video, sequential hints and practice problems.

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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?

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By Dr. Ashani Dasgupta

Ph.D. in Mathematics, University of Wisconsin, Milwaukee, United States.

Research Interest: Geometric Group Theory, Relatively Hyperbolic Groups.

Founder, Cheenta

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