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f:N to R is given by f(1)=1 and f(1)+2f(...

`f:N to R` is given by f(1)=1 and `f(1)+2f(2)+3f(3)+……+nf(n)=n(n+1) f(n)`, for `n ge 2`, then `f(1994)=`

A

`(1)/(1994)`

B

1994

C

`(1)/(3988)`

D

3998

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The correct Answer is:
C
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AAKASH SERIES-APPENDICES (REVISION EXERCISE)-MULTIPLE PRODUCT OF TWO VECTORS
  1. f:N to R is given by f(1)=1 and f(1)+2f(2)+3f(3)+……+nf(n)=n(n+1) f(n),...

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  2. If veca, vecb, vecc are three coplanar vectors, barp, barq, barr are n...

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  3. If veca, vecb, vecc are three coplanar vectors, barp, barq, barr are n...

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  4. If bara=3bari+2barj+bark,barb=bari+barj+2bark and barc=bari+3barj+3bar...

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  5. Let G(1),G(2),G(3) be the centroids of the triangular faces OBC, OCA, ...

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  6. bara,barb,barc are non coplanar and bard=x(bara xx barb) +y(barb xx ba...

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  7. barb and barc are non collinear vectors. bara is a vector such that b...

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  8. Let bara=bari+2hatj+3hatk, barb= -bari+2hatj+3bark, barc=3hati+hatj an...

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  9. If bara, barb, barc are three vectors of magnitudes sqrt(3), 1, 2 such...

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  10. The angle between the line barr=(2bari-barj+bark)+lambda(bari-barj+bar...

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  11. If barb, barc are two unit vectors along the positive x, y axes, and b...

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  12. If x(bara xx barb) +y(barb xx barc)+z(barc xx bara)=barr and [(bara, b...

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  13. If A=(1, -2, -1), B= (4, 0, -3), C = (1, 2, -1), D=(2, -4, -5), then d...

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  14. A tetrahedron of volume V = 5 has three of its vertices at the points ...

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  15. If bara, barb, barc are three vectors such that |barb|=|barc| then {(...

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  16. Angle between the line barr = (-bari+3barj+3bark)+t(2bari+3barj+6bark)...

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  17. If 4x + i(3x-y) =3+ i(-6), where x and y are real numbers, then find t...

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  18. If bara=(1)/(sqrt(10)) (3bari+bark) and barb=(1)/(7)(2bari+3barj-6bar...

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  19. The vectors veca and barb are not perpendicular and barc and bard are ...

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  20. If vecx=3hati-6hatj-hatk, vecy=hati+4hatj-3hatk and vecz=3hati-4hatj-1...

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  21. Let veca = 2 hati+hatj-2hatk, vecb=hati+hatj. If vecc is a vector suc...

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