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The coefficient of x^(n) in (1-2x)/(e^(x...

The coefficient of `x^(n)` in `(1-2x)/(e^(x))` is

A

`((1+2n))/(n!)`

B

`(-1)^(n).((1+2n))/(n!)`

C

`(-1)^(n).((1-2n))/(n!)`

D

`(-1)^(n).((1+4n))/(n!)`

Text Solution

Verified by Experts

The correct Answer is:
B
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DIPTI PUBLICATION ( AP EAMET)-EXPONENTIAL SERIES & LOGARITHMIC SERIES (APPENDIX-1)-EXERCISE 1A
  1. The coefficient of x^(n) in the expansion of (2+3x)(e^(-3x)) is

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  2. Coefficicent of x^(10) in the expansion of (2+3x)e^(-x) is

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  3. The coefficient of x^(n) in (1-2x)/(e^(x)) is

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  4. The coefficient of x^(5) in the expansion of (1-2x+3x^(2))/(e^(x)) is

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  5. The coefficient of x^(k) in the expansion of (1-2x-x^(2))/(e^(-x)) is

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  6. The coefficient of x^(n) in (1+x)/(1!)+((1+x)^(2))/(2!)+((1+x)^(3))/(3...

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  7. The coefficient of x^(n) in 1+(ax+b)+((ax+b)^(2))/(2!)+((ax+b)^(3))/(3...

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  8. The coefficient of x^(n) in the expansion of underset(n=1)overset(oo)S...

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  9. If n is odd, coefficient of x^(n) in the expansion of (1+(x^(2))/(2!)+...

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  10. If n is even, coefficient of x^(n) in the expansion of (1+(x^(2))/(2!)...

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  11. 2-(3^(2))/(2!)+(3^(3))/(3!)-(3^(4))/(4!)+....=

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  12. (1)/(2!)+(1)/(3!)+(1)/(4!)+....=

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  13. (1)/(2!)-(1)/(3!)+(1)/(4!)-(1)/(5!)+....=

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  14. -1+(2^(2))/(2!)-(2^(3))/(3!)+(2^(4))/(4!)-....=

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  15. Sum of the series 1+(3^(2))/(2!)+(3^(4))/(4!)+(3^(6))/(6!)+...."to "oo...

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  16. underset(n=0)overset(oo)Sigma(1)/((n+1)!)=

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  17. underset(n=1)overset(oo)Sigma(1)/((2n-1)!)=

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  18. underset(n=1)overset(oo)Sigma(x^(n))/((2n-1)!)=

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  19. The sum of series (1)/(2!)+(1)/(4!)+(1)/(6!)+... is

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  20. 1+(1)/(3!)+(1)/(5!)+....=

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