Question Number 136320 by radians last updated on 20/Mar/21
Answered by Olaf last updated on 20/Mar/21
$$\mathrm{coefficient}\:{x}^{\mathrm{2}} \:\mathrm{is}\:\mathrm{same}\:\mathrm{as}\:{x}^{\mathrm{3}} \:: \\ $$$$\Rightarrow\:\mathrm{C}_{\mathrm{2}} ^{\mathrm{2020}} {a}^{\mathrm{2}} {b}^{\mathrm{2018}} \:=\:\mathrm{C}_{\mathrm{3}} ^{\mathrm{2020}} {a}^{\mathrm{3}} {b}^{\mathrm{2017}} \\ $$$$\frac{\mathrm{2020}×\mathrm{2019}}{\mathrm{2}}{b}\:=\:\frac{\mathrm{2020}×\mathrm{2019}×\mathrm{2018}}{\mathrm{6}}{a} \\ $$$${b}\:=\:\frac{\mathrm{2018}}{\mathrm{3}}{a} \\ $$$${a}\:=\:\mathrm{3},\:{b}\:=\:\mathrm{2018} \\ $$
Commented by radians last updated on 20/Mar/21
$${thank}\:{you}\:{so}\:{much} \\ $$