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If a(1), a(2),…a(n) are in H.P. then a(1...

If `a_(1), a_(2),…a_(n)` are in H.P. then `a_(1).a_(2) + a_(2).a_(3) + a_(3).a_(4) + …+ a_(n-1) .a_(n)`=

A

`a_1+a_2 + . . . +a_n`

B

`(a_1+a_2+a_3 + . . . +a_n)`

C

`n(a_1 +a_2+. . . +a_n)`

D

none

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The correct Answer is:
D
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DIPTI PUBLICATION ( AP EAMET)-QUADRATIC EXPRESSIONS-EXERCISE 1B (QUADRATIC EXPRESSIONS)
  1. The extreme value of x^2 - 5x +6 is

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  2. Find the changes in the sign of the following expressions and find the...

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  3. If a(1), a(2),…a(n) are in H.P. then a(1).a(2) + a(2).a(3) + a(3).a(4)...

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  4. IF a,b,c are positive then the least value of (a +b+c)(1//a+1//b ...

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  5. If a,b,c are distinct positive numbers then the 3expression ( b+...

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  6. IF a^2 + b^2 +c^2 =1 then the range of ab+bc +ca is

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  7. In triangle ABC, range of (a^(2)+b^(2)+c^(2))/(ab+bc+ca) is (a,b,c are...

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  8. The solution set of -x^2 +3x+4gt 0 is

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  9. the solution set of x^2-4x - 21 ge 0 is

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  10. the solution set of 1 le x^2 -2x is

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  11. the solution set of x^2 gt 4x+5 is

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  12. The solution set of 2x^2-4x +5 gt 0 is

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  13. the solution set of x^2 - 2x + 2 lt 0 is

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  14. the set of all solutions of the inequation x^2-2x +5 le 0 in ...

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  15. The set of solutions of |x| ^2-5|x|+4 lt 0 is

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  16. if the expression 4x - 5x^2 +1 is positive if x lies in

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  17. the expression -7x ^2 + 8x -9 is positive if x lies in

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  18. the expression x^2 -5x-6 is negative is x lies in

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  19. The greatest positive integral value of x for which 200-x ( ...

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  20. The least integral value of x for which 33-x (2+3x )gt 0 i...

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