K=1/15+2/45+3/135+4/345+75/759

$K=\dfrac{1}{15}+\dfrac{2}{45}+\dfrac{3}{135}+\dfrac{4}{345}+\dfrac{75}{759}$

$K=\dfrac{1}{15}+\dfrac{2}{45}+\dfrac{1}{45}+\dfrac{4}{345}+\dfrac{25}{253}$

$K=\dfrac{1}{15}+\dfrac{3}{45}+\dfrac{4}{345}+\dfrac{25}{253}$

$K=\dfrac{1}{15}+\dfrac{1}{15}+\dfrac{4}{345}+\dfrac{25}{253}$

$K=\dfrac{2}{15}+\dfrac{4}{345}+\dfrac{25}{253}$

$K=\dfrac{506}{3795}+\dfrac{44}{3795}+\dfrac{375}{3795}$

$K=\dfrac{506+44+375}{3795}$

$K=\dfrac{925}{3795}$

$K=\dfrac{185}{759}$

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