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Given an A.P. whose terms are all positi...

Given an `A.P.` whose terms are all positive integers. The sum of its first nine terms is greater than 200 and less than 220. If the second term in it is 12, then its `4^th` term is:

A

8

B

16

C

20

D

24

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The correct Answer is:
C
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DISHA PUBLICATION-SEQUENCES AND SERIES -Exercise -2 : Concept Applicator
  1. Given an A.P. whose terms are all positive integers. The sum of its fi...

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  2. If a(1), a(2), …..,a(n) are in A.P. with common difference d ne 0, the...

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  3. If 1,log9(3^(1-x)+2), log3(4*3^x-1) are in A.P then x equals to

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  4. In the coefficients of rth, (r+1)t h ,a n d(r+2)t h terms in the binom...

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  5. The minimum value of (x^4+y^4+z^2)/(x y z) for positive real numbers x...

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  6. If every even term of a series is a times the term before it and every...

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  7. If y=3^(x-1)+3^(-x-1) (where, x is real), then the leastvalue of y is

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  8. Let a1, a2, a3, ...an be an AP. Prove that: 1 / (a1 an) + 1 / (a2 a(n-...

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  9. Concentric circles of radii 1,2,3,. . . . ,100 c m are drawn. The inte...

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  10. If log(e)5, log(e)(5^(x) -1) and log(e)(5^(x)-(11)/(5)) are in A.P the...

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  11. If a ,b ,c are the sides of a triangle, then the minimum value of a/(b...

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  12. The value of 1/(2!) +2/(3!) +...+999/(1000!) is equal to

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  13. If a,b,c are in H.P.then which one of the following is true

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  14. If a,b,c and the d are in H.P then find the vlaue of (a^(-2)-d^(-2))/(...

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  15. The odd value of n for which 704 + 1/2 (704) + 1/4 (704) + ... upto n ...

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  16. If (1-p)(1+3x+9x^2+27 x^3+81 x^4+243 x^5)=1-p^6p!=1 , then the value o...

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  17. The harmonic mean of (a)/(1 - ab) and (a)/(1 + ab) is :

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  18. The sum of the infinite series(2^(2))/(2!) + (2^(4))/(4!) + (2^(6))/(6...

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  19. If a,b,c re in H.Pthen which one of the following is true

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  20. ABC is a right angled triangle in which /B=90^(@) and BC=a. If n point...

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  21. If S(1), S(2), S(3),...,S(n) are the sums of infinite geometric series...

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