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What is the sum of first 10 terms of the...

What is the sum of first 10 terms of the A.P. 15, 10 ,5 ….?

A

-75

B

-125

C

75

D

125

Text Solution

Verified by Experts

The correct Answer is:
A
`S_(n)=-(n)/(2)[2a+(n-1)d]`
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NAVNEET PUBLICATION - MAHARASHTRA BOARD-ARITHMETIC PROGESSION -PRACTICE SET 3.4
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  2. On 1st Jan 2018, Sanikadecides to save Rupees 10,Rupees 11 on the seco...

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  3. A man Borrows Rs. 8000 and agrees to repay with a total interest of Rs...

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  4. Sachin invested Rs. 5000 for the 1st year, Rs. 7000 for the 2nd year, ...

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  5. There is an auditorium with 27 rows of seats. There are seats in the f...

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  6. Kargil's temperature was recorded in a week from Monday to Saturday. A...

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  7. On the world environment day tree plantation programme was arranged on...

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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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