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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:

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A DAS GUPTA-Progression, Related Inequalities and Series-Exercise
  1. If mth term of am A.P.is 1/n and nth term is 1/m find the sum of first...

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  2. The first term of an A.P. is a and the sum of first p terms is zero, s...

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  3. Given an A.P. whose terms are all positive integers. The sum of its fi...

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  4. If the sum of m terms of an A.P. is equal to the sum of either the nex...

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  5. if S1 , S2 , S3..........,Sq are the sums of n terms of q ,AP's whose ...

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  6. If S1 be the sum of (2n+1) term of an A.P. and S2 be the sum of its od...

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  7. The number of terms in an AP is even. The sum of the odd terms is 24 w...

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  8. The ratio of the sums of n terms of two Aps is (3n-13) : (5n+21). Find...

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  9. Find the AP in which the ratio of the sum to n terms to the sum of suc...

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  10. If x,2x+2,3x+3 are the first three terms of a GP, find the fifth term ...

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  11. In a GP, t4=27 and t7=729. Find t(11) where tn denotes the nth term.

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  12. In a GP, t4=27 and t7=729. Find t(11) where tn denotes the nth term.

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  13. In a GP, t(p+q)=a and t(p-q)=b. Prove that tp=sqrt(ab).

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  14. If the pth, qth and rth terms of a G.P. are a,b and c, respectively. ...

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  15. If a be the first term, b be the nth term and P be the product of n te...

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  16. If a,b,c are in GP, prove that (a^2-b^2)(b^2+c^2)=(b^2-c^2)(a^2+b^2).

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  17. If a, b, c, d are in G.P., then prove that: (b-c)^(2)+(c-a)^(2)+(d-b...

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  18. If a,b,c,d are in GP then prove that a+b,b+c,c+d are in GP.

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  19. If a,b,c,d are in GP then prove that a(b-c)^3=d(a-b)^3.

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  20. If a,b,c,d are in GP then prove that ax^3+bx^2+cx+d has a factor ax^2+...

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