Category: Permutation and Combination

Question Number 87790 by mathocean1 last updated on 06/Apr/20 $$\mathrm{How}\mathrm{many}\mathrm{handshakes}\mathrm{are}\mathrm{exchanged}$$$$\mathrm{betwen}27\mathrm{boys}?$$ Answered by TANMAY PANACEA. last updated on 06/Apr/20 $$27C_2$$$$=\frac{\mathrm{27}!}{\mathrm{2}!\mathrm{25}!}=\frac{\mathrm{27}×\mathrm{26}}{\mathrm{2}}=\mathrm{351}…

Question Number 87732 by mathocean1 last updated on 05/Apr/20 $$\mathrm{Solve}\mathrm{it}\mathrm{in}\mathbb{N}$$$${\mathrm{C}}_{\mathrm{n}}^3-{\mathrm{C}}_{\mathrm{n}}^2=5+\frac{{\mathrm{n}}^3-{6\mathrm{n}}^2}{6}$$ Commented by Tony Lin last…

Question Number 153216 by talminator2856791 last updated on 05/Sep/21 $$$$ Commented by talminator2856791 last updated on 05/Sep/21 $$\mathrm{appears}\mathrm{to}\mathrm{be}\mathrm{a}\mathrm{bug}.$$$$\mathrm{image}\mathrm{not}\mathrm{load}.$$ Terms…

Question Number 153181 by DELETED last updated on 05/Sep/21 Commented by mr W last updated on 05/Sep/21 $$dearsir:$$$$ifyoujustdoyourownexercises,i.e.$$$$whenyousolveyourquestionsby$$$${yourself},\:{you}\:{don}'{t}\:{need}\:{to}\:{use}\:{the} \…

Question Number 153173 by DELETED last updated on 05/Sep/21 Commented by mr W last updated on 05/Sep/21 $$dearsir:$$$$ifyoujustdoyourownexercises,i.e.$$$$whenyousolveyourquestionsby$$$${yourself},\:{you}\:{don}'{t}\:{need}\:{to}\:{use}\:{the} \…