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If the first and last terms of an A.P. a...

If the first and last terms of an A.P. are given, then the formula to find the sum is …….

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The correct Answer is:
`S_(n) = n/2 (a+l)`
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PREMIERS PUBLISHERS-NUMBERS AND SEQUENCES-PROGRESS CHECK
  1. A series have finite number of terms then it is called ……

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  2. A series whose terms are in …… is called Arithmetic series.

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  3. If the first and last terms of an A.P. are given, then the formula to ...

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  4. A G.P. is obtained by multiplying ……… to the preceding term.

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  5. The ratio between any two consecutive terms of the G.P. is …… and it i...

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  6. Fill in the blanks, if the term are in G.P. (1)/(8), (3)/(4), (9)/(2),...

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  7. Fill in the blanks if the following are in G.P. 7, 7/2,……

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  8. Fill in the blanks if the following are in G.P. ……., 2sqrt2, 4, …….

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  9. If first term = a, common ratio = r, then find the value of t(9)" and ...

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  10. If G.P if t(1)=(1)/(5) and t(2)=(1)/(25) then the common ratio is .

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  11. Three Non-zero numbers a, b and c will be in G.P. If and only if .

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  12. A series whose terms are in Geometric progression is called …….

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  13. When r = 1, the formula for finding sum to n terms of a G.P. is …….

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  14. When r ne 1, the formula for finding sum to n terms of a G.P. is ……..

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  15. Sum to infinite number of terms of a G.P. is ….

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  16. For what values of r, does the formula for infinite G.P. valid ?

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  17. Is the series 3 + 33 + 333 + ….a Geometric series ?

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  18. The value of r, such that 1 + r + r^(2) + r^(3) … = 3/4 is …

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  19. The sum of cubes of first n natural numbers is ……..of the first n natu...

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  20. The average of first 100 natural number is .

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