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H(1),H(2) are 2 H.M.'s between a,b then ...

`H_(1),H_(2)` are 2 H.M.'s between a,b then `(H_(1) + H_(2))/(H_(1).H_(2)) = `

A

`(a .b)/(a + b)`

B

`(a + b)/(ab)`

C

`(a - b)/(ab)`

D

`(ab)/(a - b)`

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The correct Answer is:
B
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DIPTI PUBLICATION ( AP EAMET)-SEQUENCES AND SERIES -EXERCISE
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  4. Let a(1), a(2), …., a(10) be in A.P and h(1), h(2),…. , h(10) be I H.P...

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  6. If the geometic mean between a and b is (a^(n + 1) + b^(n + 1))/(a^(n)...

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  7. If the harmonic mean between a and b is (a^(n + 1) + b^(n - 1))/(a^(n)...

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  11. The harmonic mean of two numbers is 4 their arithmetic mean is A and g...

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  12. The ratio of the harmonic mean to the geometric mean of two positive n...

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  13. If b + c, c + a , a + b are in A.P then a , b , c are in

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  14. If a^(2), b^(2), c^(2) are in A.P., then (a)/(b + c) , (b)/(c + a), (c...

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  15. IF the roots of (b-c) x^2+ (c-a) x+ (a-b) =0 are equal then ...

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  16. IF the roots of a(b-c)x^2+b (c-a) x+c (a-b)=0 are equal then a, ...

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  17. If the sum of the roots of the quadratic equation ax^(2) + bx + c = 0 ...

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  18. If the system of linear equations x+2ay+az=0, x+3by+bz=0,x+4ch+cz=0 ha...

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  19. Let f (x ) be a polynomial function of second degree. If f (1) = f( -1...

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  20. If x gt 1, y gt 1 , z gt 1 are in G.P then (1)/(1 + log x ), (1)/( 1...

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