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Re: MX2 2015 Integration Marathon Can you really make that substitution when clearly cot 0 is undefined? Also, can you show ur working for how you went from the trig to the u bit? I don't think ur integrand is quite right....

Re: 2015 permutation X2 marathon non invertible, but you still can't use the conventional method of arranging n distinct elements around a circle, then account for repetitions. For instance, consider the problem how many ways can you arrange AAABBB around a circle? Using the conventional method...

Re: 2015 permutation X2 marathon Nope, this problem is actually reasonably difficult

Re: 2015 permutation X2 marathon In how many ways can the letters of mathematics be arranged around a circle?