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Question Number 136320 by radians last updated on 20/Mar/21

Answered by Olaf last updated on 20/Mar/21

$$\mathrm{coefficient}{x}^2\mathrm{is}\mathrm{same}\mathrm{as}{x}^3:$$$$\Rightarrow {\mathrm{C}}_2^{2020}{a}^2{b}^{2018}={\mathrm{C}}_3^{2020}{a}^3{b}^{2017}$$$$\frac{2020\times 2019}{2}b=\frac{2020\times 2019\times 2018}{6}a$$$$b=\frac{2018}{3}a$$$$a=3,b=2018$$

Commented by radians last updated on 20/Mar/21

$$thankyousomuch$$

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