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If ^25Cr=^25C(2r+1),the value of ^rC5is...

If ``^25C_r=`^25C_(2r+1)`,the value of ``^rC_5`is

A

a)50

B

b)25

C

c)56

D

d)8

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UNITED BOOK HOUSE-MCQ-EXERCISE
  1. Solution sets of the inequation -2le(3x-1)/2le1[x in Z]is

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  2. Given ^9P3=x ^9P5 then the value of x is

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  3. If ^25Cr=^25C(2r+1),the value of ^rC5is

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  4. The. coefficient of 10th term in the expansion of (x+1/x)^20

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  5. The 12th term of the scries-n,(n -1), (n - 2),….

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  6. If 5.x, 405 are in G.P, then which of the following is the value of x?

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  7. The perpendicular distance of the straight line 3x + 4y + 15 = 0 from ...

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  8. The angle between the-lines x+sqrt3y+7=0and sqrt3x-y+8=0is

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  9. The distance between the two-parallel lines 3x + 4y + 9 =0and 3x+4y+7=...

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  10. The equation x^2+y^2+2gx+2fy+c=0 represents a point -circle when

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  11. The-equation of the directrix of the parabola 2x^2=3y is

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  12. If the equation x^2/(4-m)+y^2/(m-7)+1=0represents an ellipse then

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  13. The length of the latus rectum of the hyperbola 9x^2-25y^2=225is

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  14. The points (5, 2, 4), (6, -1, 2) and (8,-7, k) are collinear if k =

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  15. If | x | le y then

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  16. If it(xrarr3)(ax^2-beta)/(x-3)=12,then

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  17. 5f(x)+3f(1/x)=x+2 and y=xf(x),then dy/dx=

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  18. The slope of the tangent to the curve y=2sqrt2x

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  19. If v is the variance and sigmais the standard diveation then

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  20. A and B be two mutually exclusive events such that P(A)=3/8,P(B)=1/3,t...

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