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For the AP -3, -7, -11, … can we find d...

For the AP ` -3, -7, -11, …` can we find directly `a_(30)-a_(20)` without actually finding `a_(30)` and `a_(20)` ? Give reason for your answer.

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The correct Answer is:
`-40`
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OSWAL PUBLICATION-ARITHMETIC PROGRESSIONS -NCERT EXAMPLAR (EXERCISE-5.2)
  1. Which of the following form an A.P. ? Justify your answer. -1,-1,-1,...

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  2. Which of the following form an A.P. ? Justify your answer. 0,2,0,2,....

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  3. Which of the following form an A.P. ? Justify your answer. 1,1,2,2,3...

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  4. Which of the following form an A.P. ? Justify your answer. 11,22,33,...

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  5. Which of the following form an A.P. ? Justify your answer. (1)/(2), ...

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  6. Which of the following form an A.P. ? Justify your answer. 2,2 ^(2) ...

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  7. Which of the following form an A.P. ? Justify your answer. sqrt3, sq...

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  8. Justify whether it is true to say that -1, (-3)/(2), -2, (5)/(2), … ...

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  9. For the AP -3, -7, -11, … can we find directly a(30)-a(20) without ac...

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  10. Two A.P.'s have the same common difference. The first term of one A.P....

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  11. Two A.P have the same common difference. The first term of one A.P is ...

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  12. Is 0 a term of the AP 31, 28, 25, …? Justify your answer.

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  13. The taxi fare after each km, when the fare is Rs 15 for the first km a...

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  14. In which of the following situations, do the lists of numbers involved...

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  15. In which of the following situations, do the lists of numbers involved...

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  16. In which of the following situations, do the lists of numbers involved...

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  17. In which of the following situations, do the lists of numbers involved...

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  18. Justify whether it is true to say that the following are the nth terms...

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  19. Justify whether it is true to say that the following are the nth terms...

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  20. Justify whether it is true to say that the following are the nth terms...

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