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If an A.P., the sum of 1st n terms is 2n...

If an A.P., the sum of 1st n terms is` 2n^2 + 3n`, then the common difference will

A

a)3

B

b)4

C

c)5

D

d)6

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UNITED BOOK HOUSE-MODEL QUESTION PAPERS-SET 6-EXERCISE
  1. sqrt(4i)=

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  2. In the expansion of (1+2 x +x^2)^20, the no of-terms will be

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  3. If an A.P., the sum of 1st n terms is 2n^2 + 3n, then the common diffe...

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  4. x^2/(1-lambda)+y^2/(1-lambda)+1=0,the equation represent an ellipse if

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  5. If the straight lines 2x - 3y + 5= 0 and ax + 2y. = 6 are parallel, th...

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  6. The value of lim(xrarr4)(x^(5//2)-4^(5//2))/(x-4)is

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  7. For all values ofx and y,jf f(x + y) = f(x).f(y), f(5)= 2 and f'(0)=3,...

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  8. Two imbaised coins are tossed at a time. What is the probability of ge...

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  9. If the variance of a distribution is 4 coefficient of variation is 5%,...

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  10. Find the power set of A = {{a}, {b, c}}

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  11. If P = {4. 5},'Q = {7}. find the defined relations from P to Q.

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  12. Find the value of cos 10^@ + cos 110^@+ cos 130^@

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  13. In /\ABC, if (c + a + b) (a + b - c) = ab, find the-value of angleC.

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  14. If alpha,betabe the imaginary cube root of unity, then show that alpha...

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  15. Find the number of diagonals of a polygon having sides 10.

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  16. Show.that there will be-no term containing P^6 in the expansion of (2...

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  17. Which term of this-progression 0.004, 0.02, 0.1..... is 12.5?

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  18. Find the gradient of a straight line which is passes through the point...

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  19. Show that the points A(1,2,3) ,B(-1,-2,-1) ,C(2,3,2) and D(4,7,6) are ...

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  20. If 2f(x).+ 3f(-x) = x^2-x+1, find the value of f(1).

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