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200 logs are stacked in the following ma...

200 logs are stacked in the following manner: 20 logs in the bottom row, 19 in the next row, 18 in the row next to it and so on (see Figure). In how may rows are the 200 logs placed and how many logs are in the top row?

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OSWAL PUBLICATION-ARITHMETIC PROGRESSIONS -NCERT CORNER (EXERCISE-5.3)
  1. In an A. P. : given a = 3, n = 8, S = 192, find d.

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  2. In an A. P. : given l = 28, S = 144, and there are total 9 terms Fin...

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  3. How many terms of the AP: 9, 17, 25, . . . must be taken to give a sum...

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  4. The first term of an A.P. is 5, the last term is 45 and the sum is 400...

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  5. The first and the last terms of an A.P. are 17 and 350 respectively. I...

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  6. Find the sum of first 22 terms of an A.P. in which d = 7 and 22 nd ter...

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  7. Find the sum of first 51 terms of an A.P. whose second and third terms...

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  8. If the sum of first 7 terms of an A.P. is 49 and that of 17 terms is 2...

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  9. Show that a (1), a (2), …., a (n),… from an A.P. where a (n) is define...

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  10. Show that a (1), a (2), …., a (n),… from an A.P. where a (n) is define...

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  11. If the sum of the first n terms of an A.P. is 4n - n ^(2), what is the...

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  12. The sum of first 40 positive integers divisible by 6 is

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  13. Find the sum of the first 15 multiples of 8.

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  14. Find the sum of the odd numbers between 0 and 50.

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  15. A contract on construction job specifies a penalty for delay of com...

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  16. A sum of Rs 700 is to be used to give seven cash prizes to students...

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  17. In a school, students thought of planting trees in and around the scho...

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  18. A spiral is made up of successive semicircles, with centres alternate...

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  19. 200 logs are stacked in the following manner: 20 logs in the bottom ...

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  20. In a potato race, a bucket is placed at the starting point, which is ...

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