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Let `a_1, a_2, a_3...a_49` be in AP such that `sum_(k=0)^12(a_4k+1)=416` and `a_9+a_43=66` If `a_1^2+a_2^2+...+a_17^2=140m` then m is equal to (1) 66 (2) 68 (3) 34 (4) 33

A

68

B

34

C

33

D

66

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The correct Answer is:
B
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DISHA PUBLICATION-SEQUENCES AND SERIES -Exercise -2 : Concept Applicator
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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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  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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