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A spiral is made up of successive semici...

A spiral is made up of successive semicircles, with centres alternately at A and B, starting with centre at A, of radii 0.5 cm, 1.0 cm, 1.5 cm, 2.0 cm, . . . as shown in Figure. What is the total length of such a spiral made up of thirteen consec

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RD SHARMA ENGLISH-ARITHMETIC PROGRESSIONS-All Questions
  1. A ladder has rungs 25 cm apart, (see Figure). The rungs decrease un...

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  2. A small terrace at a football ground comprises of 15 steps each of ...

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  3. A spiral is made up of successive semicircles, with centres alterna...

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

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  5. Find the sum of the following arithmetic progressions: (i) 50 ,\ 46 ...

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  6. Find the sum of the following arithmetic progressions: (i) 41 ,\ 36 ...

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  7. Find the sum of the following arithmetic progressions: (i) (x-y)/(x+...

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  8. Find the sum to n term of the A.P. 5,\ 2,\ -1,\ -4,\ -7,\ dot,

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  9. Find the sum of n terms of an A.P. whose n t h terms is given...

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  10. If the sum of a certain number of terms of the A.P. 25, 22, 19.... ...

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  11. How many terms of the sequence 18 ,\ 16 ,\ 14 ,\ dot should be t...

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  12. How many terms are there in the A.P. whose first and fifth terms are ...

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  13. How many terms of the A.P. 9,\ 17 ,\ 25 ,\ dot must be taken so ...

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  14. How many terms of the A.P. 63, 60, 57, .... must be taken so that t...

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

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  16. The third term of an A.P. is 7 and the seventh term exceeds three time...

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  17. The first term of an A.P.is 2 and the last term is 50. the sum of all ...

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  18. If 12th term of an A.P. is -13 and the sum of the first four terms i...

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

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  20. Find the sum of all natural numbers between 1 and 100, which are divis...

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