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n A.M.\'s are inserted between 1 and 31 ...

n A.M.\'s are inserted between 1 and 31 such that the ratio of the 7th and `(n-1)` th means is 5:9. Find n.

A

12

B

13

C

14

D

15

Text Solution

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The correct Answer is:
C
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AAKASH INSTITUTE-SEQUENCES AND SERIES -Assignment (SECTION - A) One option is correct
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  3. n A.M.\'s are inserted between 1 and 31 such that the ratio of the 7th...

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  5. If the sum of three numbers which are in A.P is 27 and the product of ...

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  6. If n arithmetic means are inserted between 2 and 38, then the sum of t...

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  7. If S(n) denote the sum to n terms of an A.P. whose first term is a ...

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  8. If three positive numbers a, b, c are in A.P. and 1/a^2,1/b^2,1/c^2 a...

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  9. The sum of the series a-(a+d)+(a+2d)-(a+3d)+ up to (2n+1) terms is -n ...

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  10. Let Sn denotes the sum of the first of n terms of A.P. and S(2n)=3Sn ...

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  11. Let S(n) denotes the sum to terms of an A.P. whose first term is a . I...

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  12. If the first second and last term of an A.P. are a ,\ b ,\ a n d\ 2a\ ...

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  13. Sum of first n terms of an A.P. whose last term is l and common dif...

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  14. If one geometric mean G and two arithmetic means A(1)andA(2) are inser...

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  15. The fourth term of the G.P. 4, - 2 , 1 , … is

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  16. Find: n th term of the G.P. sqrt(3),1/(sqrt(3)),1/(3sqrt(3)),

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  17. Which term of the progression 18 ,-12 ,8, i s(512)/(729)?

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  18. The third term of a G.P. is 3. Find the product of its first five term...

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  19. "If " (a^(n)+b^(n))/(a^(n-1)+b^(n-1))" is the A.M. between" a and b, t...

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  20. If (2p)th term of a G.P is q^2 and (2q)th term is p^2 then (p+q)th ter...

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