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# Bijection Principle from I.S.I. Entrance

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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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Content
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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?

Watch the first hint

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