Thursday, 31 October 2013

maximum possible number of distinct colours used

To each element of the set S = {1, 2,............, 1000} a colour is assigned. Suppose that for any
two elements  m & n of S, if 15 divides (m + n) then they are both assigned the same colour.
What is the maximum possible number of distinct colours used?

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Define f:RR by \[f(x)= \begin{cases}(1-\cos x) \sin \left(\frac{1}{x}\right), & x \neq 0 \ 0, ...