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The sum of first ten terms of an A.P. is...

The sum of first ten terms of an A.P. is 120. The sum of next ten terms is 320. Find the first term and common difference.

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KALYANI PUBLICATION-PROGRESSION-EXERCISE
  1. In an A.P. if the ratio of the sum upto 10th term and the 10th...

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

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

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

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

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

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

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

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

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

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

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  12. The sum of first n terms of an A.P. is Sn.If Sn=n^2p and Sm=m^2p(mn...

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  13. The first term of an A.P. is a. If sum of first p terms is zero, pro...

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  14. The sum of first P terms of an A.P. is equal to that of the first Q te...

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  15. Find the sum of all odd numbers lying between 12 and 90.

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  16. Determine the sum of the numbers lying between 100 and 500 which are d...

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  17. Find the sum of all numbers lying between 1 and 100 which are divisibl...

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  18. Determine the sum of the numbers lying between 100 and 200 which are n...

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  19. Determine the sum of following series upto n terms. 1.2+2.3+3.4+…….

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  20. Determine the sum of following series upto n terms. 1.1+2.3+3.5+…….

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