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?
Watch the first hint
Other useful links:-
Subscribe to Cheenta at Youtube