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The sum of the first and the third term ...

The sum of the first and the third term of G.P. is 15 and that of the 5th and the 7th terms is 240. Find the 9th term :

A

678

B

786

C

867

D

768

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The correct Answer is:
D
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QUANTUM CAT-SEQUENCE, SERIES & PROGRESSIONS-QUESTION BANK
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  2. The sum of first three terms of a G.P. is 21 and sum of their squares ...

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  3. The sum of the first and the third term of G.P. is 15 and that of the ...

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  4. Sum of three consecutive terms in a G.P. is 42 their product is 512 . ...

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  5. The sum of three numbers in G.P. is 70, if the two extremes be multipl...

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  9. Find the sum of n terms of 0.8 + 0.88 + 0.888 + …

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  10. If the pth, qth and rth terms of a G.P. be respectively , a,b and c th...

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  11. If a,b,c are respectively the xth, yth and zth terms of a G.P. then th...

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  12. There are four numbers such that the first three of them form an Arith...

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  13. Find the sum of n terms of the series 1+3 +7 +15 + …

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  14. Find the sum to n terms :1/2+3/2^2+5/2^3+...+(2n-1)/2^n

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  15. Find the sum to n terms of the series 11+ 102+1003+10004+… :

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  17. Find the sum to n terms of the following series : 2+5+14+41 + …

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  18. Find the sum to n terms : 1+ 2x + 3x^2 + 4x^3 + … ,xne 1 :

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  19. Find the sum to infinity of the series 1+3x+5x^2+7x^3+oow h e n|x|<1.

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  20. Find the sum to first n terms : 1+2/3 + 3/(3^2) + 4/(3^3)+….

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