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The value of ""^nPr, and ""^nCr will be ...

The value of `""^nP_r`, and `""^nC_r` will be equal when

A

n=2r

B

r=0 or 1

C

n=r

D

n=3r

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JBD PUBLICATION-MODEL PAPER (6)-EXERCISE
  1. The value of sin^2 75^@-sin^2 15^@ is equal to:

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  2. If alpha, beta are the roots of the equation x^2 – 2x + 2 = 0, then t...

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  3. The value of ""^nPr, and ""^nCr will be equal when

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  4. Three numbers a,b and c are in A.P if:

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  5. Slope of the line which cuts off intecepts of equal length on the axis...

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  6. The foci of the ellipse 9x^2 +4y^2 =36 are

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  7. underset(xrarr2)lim (x^3-x^2+1) is equal to:

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  8. The number of elements in a sample space, when a die rolled twice are

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  9. Prove that: sin18^@=(sqrt5-1)/4

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  10. Prove the following: (sin5x + sin 3x)/(cos5x + cos3x)=tan4x

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  11. Find the multiplicative inverse of 7-2i.

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  12. Find the middle terms in the expansion of (x/3+ ay)^(10)

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  13. Find the term independent of x in the expansion of (x^2+1/x)^9.

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  14. Find the co-ordinates of the centroid of the triangle whose vertices a...

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  15. Find out which of the following sentences are statements and which are...

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  16. Find out which of the following sentences are statements and which are...

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  17. Write the converse of the following statements. If a number x is even,...

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  18. Write the converse of the following statements. If you do all the exer...

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  19. Find the (a) union (b) intersection of the following pair of sets : ...

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  20. Find the domain and range of sqrt(9-x^2).

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