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Plz help

Plz help me in finding 1•2+2•4+3•8+…n•2^n •=multiplication...:-)

Note by Prakher Gaushal
2 years, 10 months ago

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  Easy Math Editor

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Sorry ,but I didn't have the patience to write it down in \(|LaTeX\) but couldn't let your doubt unattended , sohere's my solution .

P.S. If you find any mistakes, just tell me . I wrote the solution in a hurry !!!

Azhaghu Roopesh M - 2 years, 9 months ago

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Thanks

Prakher Gaushal - 2 years, 2 months ago

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It think I told the same anyway nice to see your handwriting . Is this your backside of your project file?

U Z - 2 years, 9 months ago

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Yeah, correctly guessed :)

Azhaghu Roopesh M - 2 years, 9 months ago

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Great.

Let me echo my comment in this note

\(\sum_{r=1}^{n} rx^r = \frac{x+(nx-n-1)x^{n+1}}{(x-1)^2}\)) is a useful formula to be aware of, to sum scenarios like this.

Calvin Lin Staff - 2 years, 9 months ago

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slide the series , and multiply it by 2 then take the difference , a g.p will be formed.next is easy

U Z - 2 years, 10 months ago

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What is the sum for \( n = 1, 2, 3, 4, 5 \)?

Calvin Lin Staff - 2 years, 10 months ago

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Can't get what u want to say.....

Prakher Gaushal - 2 years, 10 months ago

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Sir wants to say write the genral term for the series that is and then put corresponding values for n

U Z - 2 years, 10 months ago

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