User talk:110.138.150.102

Combination add
$$...19,626 + 19,627 + 19,628 = 192,599,751$$ $$((19626/ 2)+0.5) * 19626 = 192,599,751$$

$$...6,910,572,910,921,895,577 + 6,910,572,910,921,895,578 + 6,910,572,910,921,895,579 = 23,878,008,978,583,760,667,966,397,074,750,820,410$$ $$((6,910,572,910,921,895,577/2)+0.5)*6,910,572,910,921,895,577 = 23,878,008,978,583,760,667,966,397,074,750,820,410$$

Remember for combination
$$((x/ 2)+0.5) * x =$$ $$2-((x/ 2)+0.5) * x =$$