In advanced level pure mathematics mainly we consider three counting principles in combinatorics and many of our questions are related to multiplication principle and addition principle. What are the examples you can suggest to apply inclusion exclusion principle ?
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Janaka RodrigoLevel 3
What is the simplest way of geometrically demonstrating the combinatorics relationship n+1 choose 2 is equal to n(n+1)/2 , in another form C(n+1,2)=n(n+1)/2