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200 logs of wood are stacked in the foll...

200 logs of wood 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.In how many rows 200 logs are placed and how many logs are there in the top row?

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CHETANA PUBLICATION-Arithmetic Progression-EXERCISE
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  2. A farmer borrows ₹1000 and agrees to repay with a total interest of ₹1...

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  3. The sequence -10,-6,-2,2,…… a)is an A.P, Reason d=-16 b)is an A.P, Rea...

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  4. Sum of first five multiples of 3 is…. a)45 b)55 c)15 d)75

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  5. For an A.P.: 2,-2,-6,-10,…. find d. a)-4 b)2 c)4 d)1

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  6. For an A.P, if a=-3 and d=4, then find tn.

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  7. Determine whether following sequence is an A.P : 2,-2,-6,-10,….

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  8. In an A.P, a=6 and d=3. Then find S27.

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  9. Find the 19th term of the following A.P. 7,13,19, 25,…

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  10. Find the sum of all natural numbers from 1 to 140 which are divisible ...

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  12. Find the consecutive terms in an A.P whose sum is 12 and the sum of th...

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  13. If the sum of p terms of an A.P is equal to the sum of q terms, then ...

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  14. Mr. Ajay borrows ₹3,25,000. He paid ₹30,500 in the first month and the...

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  15. 200 logs of wood are stacked in the following manner:20 logs in the bo...

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  16. If sum of m terms is n and sum of n terms is m,then show that the sum ...

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  17. How many terms of the A.P 16,14,12,….. Are needed to obtain the sum 60...

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  18. If pth, qth and rth terms of an A.P. are l, m, n respectively, show th...

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