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If a ,b ,c are in G.P. and a-b ,c-a ,a n...

If `a ,b ,c` are in G.P. and `a-b ,c-a ,a n db-c` are in H.P., then prove that `a+4b+c` is equal to 0.

A

-3

B

0

C

3

D

none of these

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The correct Answer is:
B
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ML KHANNA-PROGRESSIONS -PROBLEM SET - 5 (MULTIPLE CHOICE QUESTIONS)
  1. If a, b, c are in H.P. then the value of ((1)/(b) + (1)/(c) - (1)/(a))...

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  2. The next term of the sequence 1,5,14,30,55,... is

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  3. If a ,b ,c are in G.P. and a-b ,c-a ,a n db-c are in H.P., then prove ...

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  4. If a,b, and c are in G.P then a+b,2b and b+ c are in

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  5. The sum of first n terms of the series 1^(2) + 2.2^(2) + 3^(2) + 2.4^(...

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  6. The sum of first n terms of the series 3.1 + 2^(2) + 3.3^(2) + 4^(2)+…...

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  7. 1. If x ,y and z are respectively the p(th), q(th), and r(th) terms, r...

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  8. A.G.P. and H.P. have the same pth, qth and rth terms as a, b, c respec...

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  9. If x ,ya n dz are in A.P., a x ,b y ,a n dc z in G.P. and a ,b ,c in H...

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  10. Suppose a, b, c are in A.P. and a^(2), b^(2), c^(2) are in G.P. If a l...

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  11. If x, y, z are in A.P. then xth, yth and zth terms of any G.P. are in

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  12. If T(p), T(q), T(r) of an A.P. (G.P. or H.P.) are in A.P. (G.P. or H.P...

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  13. If x, y, z, w in N be four consecutive terms of an A.P., then T(x), T(...

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  14. If in any progressin the difference of any two consecutive terms bears...

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  15. In any progression, if (t(2)t(3))/(t(1)t(4)) = (t(2) + t(3))/(t(1) + t...

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  16. In a certain progression, three consecutive terms are 30, 24, 20. Then...

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  17. If (m + 1)th, (n + 1)th and (r + 1)th terms of an A.P. are in G.P. and...

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  18. If cos (theta - alpha), cos theta, cos (theta + alpha) are in H.P. the...

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  19. If A = lim(n rarr oo) sum(r = 1)^(n) tan^(-1) ((1)/(2r^(2))), then A i...

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  20. If S(n) = sum(r=1)^(n) (2r+1)/(r^(4) + 2r^(3) + r^(2)),"then S"(20) =

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