If (20)¹⁹ + 2(21)(20)¹⁸... |JEE Main 2023 | Binomial Theorem

JEE MAIN 2023

08-04-2023 S2

Question

If $(20)^{19}+2(21)(20)^{18}+3(21)^2(20)^{17}+\ldots \ldots . .+20(21)^{19}=\mathrm{k}(20)^{19}$, then k is equal to $\_\_\_\_$ .

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Question Tags

JEE Main

Mathematics

Hard

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