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If a,b,c,d are in H.P., then ab+bc+cd is...

If a,b,c,d are in H.P., then ab+bc+cd is equal to

A

3ac

B

3ad

C

(a + b) (c + d)

D

none

Text Solution

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The correct Answer is:
B
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ML KHANNA-PROGRESSIONS -PROBLEM SET - 5 (MULTIPLE CHOICE QUESTIONS)
  1. If p, q, r are + ive, then the minimum value of p^(log q - log r) + q^...

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  2. (i) The value of x + y + z is 15. If a, x, y, z, b are in AP while the...

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  3. If a,b,c,d are in H.P., then ab+bc+cd is equal to

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  4. If a(a), a (2), a (3),…., a(n) are in H.P. and f (k)=sum (r =1) ^(n) a...

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  5. If A, G & H are respectively te A.M., G.M. & H.M. of three positive nu...

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  6. In an H.P., T(p) = q (p + q), T(q) = p (p + q), then p and q are the r...

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  7. If four positive numbers a, b, c, d are in H.P. then which one of the ...

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  8. The A.M., G.M. and H.M. between two positive numbers a and b are equal...

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  9. The AM, HM and GM between two numbers are (144)/(15), 15 and 12, but n...

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  10. If 2(y-a) is the harmonic mean between y-x and y-z then x-a, y—a and z...

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  11. IF a(1),a(2),a(3),"...."a(10) be in AP and h(1),h(2),h(3),"...."h(10) ...

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  12. If a(1), a(2), a(3) and h(1), h(2), h(3) are the A.M.'s and H.M.'s bet...

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  13. If H(1), H(2),…., H(n) be n harmonic means between a and b then (H(1) ...

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  14. If n is a root of the equation (1 - ab) x^(2) - (a^(2) + b^(2)) x - (1...

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  15. If (1)/(b+c) , (1)/(c+a) and (1)/(a+b) are in AP, then a^(2), b^(2) an...

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  16. If three numbers are in G.P., then the numbers obtained by adding the ...

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  17. If three numbers are in H.P., then the numbers obtained by subtracting...

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  18. If a ,b ,c ,d are in G.P., then prove that (a^3+b^3)^(-1),(b^3+c^3)^(-...

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  19. If a, b, c, d be four numbers of which the first three are in AP and t...

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  20. If S(k) denotes the sum of first k terms of a G.P. Then, S(n),S(2n)-S(...

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