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Find the sum of: 18 terms of 57 + 49 +...

Find the sum of:
18 terms of 57 + 49 + 41 + .....,

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The correct Answer is:
198
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ICSE-SEQUENCE AND SERIES -EXERCISE 14 (c)
  1. Find the sum of: 10 terms of 5 +8 + 11+ ....,

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  2. Find the sum of: 18 terms of 57 + 49 + 41 + .....,

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  3. Find the sum of: n terms of 4, 7 , 10, ....

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  4. Find the sum of: 24 terms and n terms of 2 (1)/(2) , 3 (1)/(3) , 4 (...

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  5. Find the sum of: 101 + 99 +97+ .... 47.

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  6. Find the sum of all the numbers between 100 and 200 which are divisibl...

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  7. The sum of a series of terms in A.P. is 128. If the first term is 2 an...

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  8. The sum of 30 terms of a series in A.P., whose last term is 98, is 163...

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  9. If the sums of the first 8 and 19 terms of an A.P. are 64 and 361 resp...

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  10. Find the number of terms of the series 21, 18, 15, 12...which must be ...

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  11. The sum of n terms of an A.P. series is (n^(2) + 2n) for all values of...

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  12. The third term of an arithmetical progression is 7, and the seventh te...

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  13. The interior angles of a polygon are in arithmetic progression. The sm...

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  14. Determine the sum of first 35 terms of an A.P. if t(2), = 1 and t(7) ,...

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  15. Find the sum of all natural numbers between 100 and 1000 which are mul...

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  16. How many terms of the A.P. 1,4,7.... are needed to give the sum 715?

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  17. Find the rth term of an A.P., sum of whose first n terms is 2n + 3n^(2...

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  18. In an arithmetical progression, the sum of p terms is m and the sum of...

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  19. The sum of the first fifteen terms of an arithmetical progression is 1...

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  20. The sum of the first six terms of an arithmetic progression is 42. The...

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