Bijection principle is a very useful tool for combinatorics. Here we pick up a problem that appeared in I.S.I.'s B.Stat-B.Math Entrance.
Can you teach me the Bijection principle?
Bijection principle is taught Cheenta Early Bird Math Olympiad program
Is there any book or PDF file where I can read it?
Yes. You may consult books like Principle and Techniques of Combinatorics or Excursion in Mathematics
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