Category: Algebra

Question Number 10493 by ABD last updated on 14/Feb/17 $$\frac{1}{2!}+\frac{2}{3!}+\frac{3}{4!}+\frac{4}{5!}+\dots +\frac{17}{18!}=?$$ Answered by mrW1 last updated on 14/Feb/17 $$since\frac{n}{(n+1)!}=\frac{1}{n!}-\frac{1}{(n+1)!}$$$$\frac{1}{2!}+\frac{2}{3!}+\frac{3}{4!}+\frac{4}{5!}+\dots +\frac{17}{18!}$$$$=\left(\frac{\mathrm{1}}{\mathrm{1}!}−\frac{\mathrm{1}}{\mathrm{2}!}\right)+\left(\frac{\mathrm{1}}{\mathrm{2}!}−\frac{\mathrm{1}}{\mathrm{3}!}\right)+\left(\frac{\mathrm{1}}{\mathrm{3}!}−\frac{\mathrm{1}}{\mathrm{4}!}\right)+\centerdot\centerdot\centerdot+\left(\frac{\mathrm{1}}{\mathrm{17}!}−\frac{\mathrm{1}}{\mathrm{18}!}\right) \…

Question Number 76009 by Rio Michael last updated on 22/Dec/19 $$hiwdoisolve$$$$2^x=4x?$$ Answered by mr W last updated on 22/Dec/19 $$\mathrm{2}^{{x}}…

Question Number 76003 by mivheal last updated on 22/Dec/19 $$22+2$$ Answered by 21042004 last updated on 22/Dec/19 $$\mathrm{So}\mathrm{simple}:$$$$22+2=24$$ Terms…

Question Number 10463 by ABD last updated on 10/Feb/17 $$x\in Z$$$$-1⩽\mid x-3\mid <5\Rightarrow \mathrm{\Sigma }=?$$ Answered by mrW1 last updated on 10/Feb/17 $$-1⩽\mid x-3\mid isalwaystrue$$$$ \…

Question Number 75990 by Ajao yinka last updated on 21/Dec/19 Terms of Service Privacy Policy Contact: info@tinkutara.com