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A1 and A2 are arithmetic mean between a ...

`A_1 and A_2` are arithmetic mean between a and b also `G_1 and G_2` are geometric mean then `(G_(1).G_(2))/(A_(1)+A_2)` = ............ .

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The correct Answer is:
`(ab)/(a+b)`
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KUMAR PRAKASHAN-OBJECTIVE SECTION AS PER NEW PAPER SCHEME -Sequence and Series (Fill in the blanks )
  1. How many terms of G.P. 3, 3^2, 3^3, … are needed to give the sum 120?

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  2. Find the 20th and nth term of the GP. 5/2, 5/4, 5/8………

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  3. A1 and A2 are arithmetic mean between a and b also G1 and G2 are geome...

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  4. For numbers 6 and 24, A - G = ...... .

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  5. 10 is Geometric mean between 5 and x then x = ......... Where x in R^(...

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  6. 12 is arithmetic mean between x and 22 then x = ............

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  7. 10 arithmetic mean between a and b are A(1),A(2),A(3).........A(10) th...

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  8. If sumn = 55 then sumn^2 . = ...............

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  9. sum(r=1)^n(2r+1)=...... .

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  10. Sum of the series 1-(1)/(2)+1/(2^2)-1/(2^3)+............oo=.........

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  11. .......... is the 20^(th) term of sequence a(n)=(n-1)(2-n) (n-3).

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  12. 3,(9)/(2),6,(15)/2 ............ Sequence has 10^(th) term a(10) = .......

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  13. 9^(th) term of arithmetic sequence is 30 then sum of its 17 terms .......

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  14. Third term of arithmetic sequence is 9 and tenth term is 21. Then sum ...

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  15. For arithmetic sequence a = 2 and a5 = 14 then d = ........

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  16. For arithmetic sequence a(8) =23 common difference d = 5 then a = .......

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  17. For arithmetic sequence

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  18. For an A.P a = 20 and l = 97 then S(20)= ..........

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  19. If a, b, and c are in A.P then (a + 2b -c) . ( 2b +c-a) . (c+a-b) = .....

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  20. For arithmetic sequence a(1),a(2),a3 ........ If a(1)+a(5)+a(10)+a(15)...

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