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If a (r) is the coefficient of x^r in th...

If `a _(r)` is the coefficient of `x^r` in the expansion of `(1+ x+x^(2)) ^(n),` then the value of `a_(1)- 2a_(2) +3a_(3)-4a_(4)+…-2na_(2n)` is -

A

0

B

n

C

`-n`

D

2n

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The correct Answer is:
C
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CHHAYA PUBLICATION-MCQ's-QUESTION PAPER 6
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  5. There are 10 points in space of which 5 points are in the same plane, ...

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  8. If x+1/x =sqrt3, then one value of x is-

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  10. From a set of 100 cards numbered 1 to 100, one card is drawn at random...

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  11. Let S(k): 1+3+5+…+(2k-1) =3+k^(2), state which of the following is tru...

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  12. If the term independent of x in the expansion of (sqrtx +(k)/(x^(2)))^...

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  13. If 5/3 (2-x)ge 3/5 (x-2), state which of the following is true-

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  14. If (cos theta + i sin theta)(cos 2 theta +i sin 2 theta ) …(cos n thet...

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  15. Let z(1) and z(2) be the roots of z ^(2)+az+b=0. If the origin, z(1) ...

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  16. The number of terms in the expansion of (a+b+c)^(10) is-

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  17. A straight line passes through P (1,2) and is such that its intercept...

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