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If (20)^19+2(21)(20)^18+3(21)^2(20)^17+....

If `(20)^19+2(21)(20)^18+3(21)^2(20)^17+. . .+20(21)^19=k(20)^19`, then k is equal to _____

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JEE MAINS PREVIOUS YEAR-JEE MAIN 2023-Question
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  11. The number of way ,in which 5 girls and 7 boys can be seated at a roun...

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  12. Let I(x)=int((x+1))/(x(1+xe^(x))^(2))dx, x>0.If lim (xrarroo)I(x)=0,th...

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