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Fill in the blanks If Sn = 5n^2 +3n, th...

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If `S_n = 5n^2 +3n, then n^(th) term is `…….

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If s_(n) the sum of first n terms of an A.P, is given by s_(n)=5n^(2)+3n, then find its n^(th) terms.

The sum of first n terms of an A.P. is 5n^(2) + 3n . If the nth term is 168, find the value of n. Also find the 20th term of the A.P.

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AGRAWAL PUBLICATION-ARITHMETIC PROGRESSIONS-EXAMPLE
  1. Fill in the blanks If 4/5, a, 2 are three consective terms of an AP t...

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  2. Fill in the blanks If 4, x1, x2, x3, 28 are in AP then x3 = ……………

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  3. Fill in the blanks If Sn = 5n^2 +3n, then n^(th) term is …….

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  4. Fill in the blanks Find the 16^(th) term of the AP: 2,7,12,17,………

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  5. Fill in the blanks The number of terms of AP: 18, 16, 14, ……. That ma...

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  6. Fill in the blanks Secons term of the AP if its sn = n^2 +2n is …….

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  7. Find the sum of the first 100 natural numbers.

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  8. It the mean of the first n natural number is 15, then find n.

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  9. If in an A.P, a=15, d=-3 and an = 0, then find the value of n.

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  10. Find the number of terms in the A.P: 18, 15 1/2,13,…., -47.

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  11. Find the common difference of the Arithmetic Progression (A.P)

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  12. Justify whether it is true to say that -1, -3/2, -2, 5/2, …..from an A...

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  13. How many 2-digit numbers are divisuble by 3?

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  14. In an AP, if the common difference (d) = -4, and the seventh term (a7)...

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  15. Write the n^(th) term of the A.P. 1/m ,(1+m)/m, (1+2m)/m.

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  16. If the n^(th) term of the A.P. -1,4,9,14, … is 129, find the value of ...

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  17. Find the 9th term from the end (towards the first term) of the A.P. 5,...

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

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  19. If the first three terms of an A.P are b, c abd 2b, then find the rati...

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  20. What is the common difference of an A,P in which a(21) - a7 =84?

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