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There are 25 rows of seats in an auditor...

There are 25 rows of seats in an auditorium. The first row is of 20 seats, the second of 22 seats, the third of 24 seats and so on . How many seats are there in the 21st row ?

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60 seats
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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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  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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