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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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The correct Answer is:
16 rows, 5 logs
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NAGEEN PRAKASHAN ENGLISH-ARITHMETIC PROGRESSION-Exercise 5c
  1. Find the value of 'x' if 1+6+11+...+x=189

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  2. (a) Find the sum of first 200 even natural numbers. (b) Find the sum...

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  3. Find the sum of n terms of an A.P. whose nth term is (2n+1).

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  4. The sum of n terms of a series is n(n+1) . Prove that it is an A.P. al...

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  5. The sum of n terms of a series is (3n^(2)+2n). Prove that it is an A.P...

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  6. The sum of first 5 terms and first 15 terms of an A.P. are equal. Fin...

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  7. The sum of first 8 terms and first 24 terms of an A.P. are equal. Find...

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  8. The sum of15 terms of an A.P. is zero and its 4th term is 12. Find its...

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  9. The sum of first 8 terms of an A.P. is 64 and that of first 15 terms i...

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  10. If the m^(t h) term of an A.P. is 1/n and the n^(t h) terms is 1/m , s...

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  11. If a(1), a(2), a(3) , … are in A.P. , such that a(1) + a(5) +a(10) ...

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  12. The first term, last term and common difference of an A.P. are respect...

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  13. If S(n) denotes the sum of first n terms of an AP, then prove that S(1...

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  14. Yasmeen saves Rs. 32 during the first month, Rs. 36 in the second mont...

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  15. The sum of the first five terms of an AP and the sum of the first seve...

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  16. 200 logs are stacked in the following manner: 20 logs in the bottom ...

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  17. The ratio of the sum of n terms of two A.P. s is (7n+1):(4n+27) . Fin...

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  18. If the sum of first 7 terms of an AP is 49 and that of 17 terms is ...

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  19. The famous mathematician associated with finding the sum of the first ...

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  20. If S1 is the sum of an arithmetic progression of ' n ' odd number ...

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