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In a scholl students thought of planting...

In a scholl students thought of planting trees in and around the school to reduce air pollution. It was decided that the number of tress, that each section of each class will plant, will be the same as the class, in which they are studying, e.g., a section of Class I with plant I tree, a section of Class II will plant 2 trees and so on till Class XII. Three are three sections of each class. How many tress will be planted by the students ?

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OSWAAL PUBLICATION-ARITHMETIC PROGRESSIONS-TEXTBOOK CORNER EXERCISE 1.3
  1. Find the sum of the following APs : 2,7,12,…to 10^(th) terms.

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  2. Find the sums given below : (i) 7+10(1)/(2)+14+……..+84 (ii) 34+32...

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  3. In an AP: (i) given a=5, d=3, a(n)=50, find n and S(n). (ii) give...

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  4. How many terms of the AP:9,17,2…. Must be taken to give a sum of 636.

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

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  6. The first and the last terms of an A.P are 17 and 350 respectively. If...

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

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  8. Find the sum of first 51 terms of an AP whose second and third term ar...

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  9. If the sum of first 7 terms of an A.P is 49 and that of 17 terms is 28...

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  10. Show that a(1), a(2), ….,a(n),… form an A.P where an is defined as bel...

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

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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 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 specific a penalty for delay of complet...

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

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  17. In a scholl students 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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