Try the problem
This problem of Bijection Principle is from B.Stat, B.Math Entrance.
How many natural numbers less that 
are there, whose sum of digits equals 7?
Watch the first hint
Other useful links:-
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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 are there, whose sum of digits equals 7?
Watch the first hint
Other useful links:-
Subscribe to Cheenta at Youtube
