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The sum of series Sigma(n=1)^(oo) (2n)/(...

The sum of series `Sigma_(n=1)^(oo) (2n)/(2n+1)!` is

A

e

B

`e^(-1)`

C

2e

D

`2e^(-1)`

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The correct Answer is:
b
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OBJECTIVE RD SHARMA ENGLISH-EXPONENTIAL AND LOGARITHMIC SERIES-Exercise
  1. The value of sqrt(c ) rounded off of three decimal places is

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  2. The sum of the series 1+(1+a)/(2!)+(1+a+a^(2))/(3!)+(1+a+a^(2)+a^(3...

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  3. The sum of series Sigma(n=1)^(oo) (2n)/(2n+1)! is

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  4. The value of log(3) e- log(9) e + log(27) e- log(81) e+…infty is

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  5. Prove that (4)/(1!) + (11)/(21) + (22)/(3!) + (37)/(4!) + (56)/(5!) +...

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  6. The coefficient of x^n in the expansion of (1+(x^(2))/(2!)+(x^(4))/(4!...

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  7. The coefficent of x^(n) in the expansion of (1+(x^(2))/(2!)+(x^(4))/(4...

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  8. If alpha,beta are the roots of the equation ax^(2)+bx+c=0 then log(a-b...

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  9. The sum of the series 1+(1+2)/(2!)+(1+2+2^(2))/(3!)+(1+2+2^(2)+2^(3)...

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  10. The sum of the series 1+(1^2+2^2)/(2!)+(1^(2)+2^(2)+3^(2))/(3!)+(1^(...

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  11. The coefficent of x^(n) in the series 1+(a+bx)/(1!)+(a+bx)^(2)/(2!)+...

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  12. The sum of the series (1^(2).2^(2))/(1!)+(2^(2).3^(2))/(2!)+(3^(2).4^(...

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  13. The value of (x+y)(x-y)+1/(2!)(x+y)(x-y)(x^2+y^2)+1/(3!)(x+y)(x-y)(x^4...

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  14. If e^(x)=y+sqrt(1+y^(2) then the value of y is

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  15. If (e^(5x)+e^(x))/(e^(3x)) is expand in a series of ascending powers o...

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  16. In the expansion of (e^(7x)+e^(3x))/(e^(5x)) the constant term is

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  17. The value of sqrt(2-1)/sqrt(2)+3-2sqrt(2)/(4)+(5sqrt2-7/6)sqrt(2)+17-1...

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  18. If y=2x^(2)-1 then (1)/(x^(2))+(1)/(2x^(4))+(1)/(3x^(6))+…infty equals...

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  19. The sum of sum(n=1)^(oo) ""^(n)C(2) . (3^(n-2))/(n!) equal

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  20. If (e^(x))/(1-x) = B(0) +B(1)x+B(2)x^(2)+...+B(n)x^(n)+... , then the ...

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