book Maths Puzzle Numerical Ability

How many games have to be played to determine a champion from 64 teams in a tripple elimination tournament?

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book Other Question

Multiply: [(1/5)a + (2/3)][(1/5)a – (1/6)]
I am having problems with this problem. can someone show me how to do this one.

Thanks alot.
If f(x)=x^2-3x+5, find f(1)-f(4)