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The fifth and ninth terms of an A...

The fifth and ninth terms of an A.P. are respectively -15 and -13. Find the sum of first ten terms.

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KALYANI PUBLICATION-PROGRESSION-EXERCISE
  1. Find the rth term of an A.P., the sum of whose first n terms is 2n+3n^...

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  2. The first term and common difference of an A.P. are 3 and 2 respective...

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  3. The fifth and ninth terms of an A.P. are respectively -15 an...

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  4. The first term and common difference of an A.P. are respectively 4 and...

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  5. The first term and common difference of an A.P. are respectively -2 an...

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  6. The first term and last term of an A.P. are respectively 1 and 157. If...

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  7. The first term and last term of an A.P. are 5 and 123 respectively. ...

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  8. If the sum upto 21st term of an A.P. is 630, determine the 11th ...

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  9. If 18th term of an A.P. is 52, determine the sum upto 35th term.

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  10. In an A.P. if the ratio of the sum upto 10th term and the 10th...

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  11. The seventh term of an A.P. is 20 and the sum of first twenty terms ...

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  12. The sum of first ten terms of an A.P. is 120. The sum of next ten term...

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  13. In an A.P. the ratio of 7th term to 11th term is 19 : 31 and the sum ...

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  14. The sum of first nine terms of an A.P. is 171 and that of 24 terms is ...

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  15. In an A.P. the nth term is p and the sum of first n terms is q. Show t...

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  16. If {S1,S2,S3} denoted the sum of n terms of three series in A.P. the f...

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  17. The sum of first n terms of an A.P. is m and that of first m terms is...

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  18. The ratio of sum of the first n terms of two series in A.P is (3n + 8)...

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  19. In an A.P. the pth and qth terms are respectively a and b. Show that t...

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  20. If the first terms, second term and the last term of an A.P. are respe...

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