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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?


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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


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