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The first term of an A.P. is 2 and the n...

The first term of an A.P. is 2 and the nth term is 41. What is the value of n, if `S_(n) = 860` ?

A

31

B

30

C

41

D

40

Text Solution

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The correct Answer is:
D
`S_(n)=(n)/(2)(t_(1)+t_(n))`
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NAVNEET PUBLICATION - MAHARASHTRA BOARD-ARITHMETIC PROGESSION -PRACTICE SET 3.4
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  5. There is an auditorium with 27 rows of seats. There are seats in the f...

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  8. Choose the correct alternative answer for each of the following subque...

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  9. The first four terms of an Ap whose first term is -2 and the common di...

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  10. What is the sum of the first 30 natural numbers?

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  11. For an A.P. if t(7)=4.d=-4.then a=…..

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  12. For an A.P. if a=3.5,d=0,n=101, then t(n)=….

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  13. The 21st term of an AP whose first two terms are -3 and 4, is

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  14. If for an A.P.,d=5, then t(18)-t(13)=….

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  15. The sum of first five multiples of 3 is

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  16. The sum of the first ten terms of the A.P.15,10,5,….is……

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  17. The sum of an A.P. is 1 and the nth term is 20. If S(n)=399, then n=…....

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  18. The 4th term from the end of an AP -11, -8, -5, …, 49 is

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  19. The sun of the 5th and the 7th terms of an AP is 52 and the 10th term ...

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  20. Find the sum of the first ten terms of the A.P. whose 4th term is -15 ...

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  21. Two A.P's are given 9,7,5..and 24,21,18,….If n^(th)term of both the pr...

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