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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 Fig), in how many rows are the,200 logs placed and how many logs are in the top row ?

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The correct Answer is:
number of rows =16, logs in the top row= 5
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SWAN PUBLICATION-ARITHMETIC PROGRESSIONS-Exercise 5.3
  1. In an AP :- given a = 3, n = 8, S = 192, find d.

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  2. In an AP :- given l = 28, S = 144, and there are total 9 terms. Find ...

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

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

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  5. The first and last terms of an AP are 17 and 350 respectively. If the ...

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  6. Find the sum of first 22 terms of an AP in which d=7 and 22nd term is ...

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  7. Find the sum of first 51 terms of an AP whose second and third terms a...

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  8. If the sum of first 7 terms of an AP is 49 and that of 17, terms is 28...

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  9. Show that a1,a2,….an,…form an AP where an is defined as below,- an=3+4...

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  10. Show that a1,a2,….an,…form an AP where an is defined as below,- an=9-5...

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  11. If the sum of the first n terms of an AP is 4n - n^2, what is the firs...

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  12. Find the sum of the first 40 positive integers divisible by 6.

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  13. Find the sum of 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 comple...

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

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  17. In a school, student thought of planting trees in and around the schoo...

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

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

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  20. In a potato race, a bucket is placed at the starting point, which is 5...

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