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In a school, students thought of plantin...

In a school, students thought of planting trees in an around the school to reduce air pollution. It was decided that the number of trees, 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 will plant 1 tree, a section of Class II will plant 2 trees and so on till Class XII. There are three sections of each class. How many trees will be planted by the students?

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VGS PUBLICATION-BRILLIANT-PROGRESSIONS-EXERCISE
  1. Find the sum of the first 40 positive intergers divisible by 6.

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

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  3. In a school, students thought of planting trees in an around the schoo...

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  4. A sprial is made up of successive semicircles, with centres alternatel...

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  5. 200 logs are stacked in the following manner : 20 logs in the bottom r...

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  6. In a bucket and ball race, a bucket is placed at the starting point. W...

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  7. A runner starts from the bucket, picks up the nearest ball, runs back ...

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  8. Find which of the following are not G.P. (i) 6,12, 24, 48, ......

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  9. Find which of the following are not G.P. (ii) 1,4,9,16,.....

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  10. Find which of the following are not G.P. (iii) 1, -1, 1, -1,......

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  11. Find which of the following are not G.P. (iv) -4, -20, -100, -500,....

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  12. Explain why each of the lists above is a G.P. (i) 1, 4, 16, 64, 256,...

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  13. Explain why each of the lists above is a G.P. (ii) 550, 605, 665.5, ...

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  14. Explain why each of the lists above is a G.P. (iii) 256, 128, 64,32,...

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  15. Explain why each of the lists above is a G.P. (iv) 18, 16.2, 14.58, ...

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  16. To know about a G.P. What is minimum information that we need?

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  17. Write the G.P. If the first term a=3, and the common ratio r= 2.

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  18. Write G.P. If a = 256, r = (-1)/2.

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  19. Find the common ratio of the G.P. 25, -5, 1, (-1)/5.

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  20. Which of the following list of number form G.P. ? (i) 3, 6, 12, .......

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