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If i^2=-1,then sum(n=0)^225i^n is...

If `i^2=-1`,then `sum_(n=0)^225i^n` is

A

a)0

B

b)1+i

C

c)-1

D

d)i

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UNITED BOOK HOUSE-ANNUAL EXAMINATION QUESTION PAPERS 2015-EXERCISE
  1. If 3sintheta+4costheta=5,then 4sintheta-3costheta=

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  2. If i^2=-1,then sum(n=0)^225i^n is

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  3. If 16Cr = 16C(2r+1) then the vaue of r is

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  4. The coefficient of x^17in the expansion of(x-1)(x-2)(x-3)….(x-18) is

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  5. Find the slope of the lines : Making inclination of 60^(@) with the...

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  6. Find the distance of the point (3, - 5) from the line 3x - 4y - 26 = ...

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  7. lim(xrarr0)(sinalphax)/(e^(betax)-1)(alpha,beta!=0)equals to

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  8. IF f(x)=x|x|,then the value of f'(-1)is

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  9. If y=2x+3,and variance of y is 4,then the standard deviation of x is

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  10. IfP(A)=0.54,P(B)=0.69and P(AcapB)=0.35,then the value of P(A'cupB')is

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  11. Let R be the relation defined on the set N of natural numbers as R ={(...

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  12. If 2f(x)+3f(-x)=2x+1,then find f(x).

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  13. Solve :tanx+tan2x+tan3x=tanxtan2xtan3x,where 0lexle2pi

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  14. In a /\ABC,sin^2A+cos^2C=cos^2Bfind angleC

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  15. Find the principal amplitude of-3-sqrt3i

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  16. If y=x+x^2+x^3+...oowhere|x|<1,prove that x=y/(1+y)

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  17. Show that the middle term in the expansion of (x+1)^(2n) is (1.3.5.......

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  18. The co-ordinates of the focus of the parabola described paraetrically...

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  19. Determine the equation of the straight line through the point (2,3)whi...

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  20. Prove that the derivative of an odd function an ever function .

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