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For what value of n, the nth terms of th...

For what value of n, the nth terms of the arithmetic progressions 63, 65, 67, … and 3, 10, 17,… are equal?

A

11

B

12

C

13

D

15

Text Solution

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The correct Answer is:
C
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DISHA PUBLICATION-SEQUENCES AND SERIES -EXERCISE -1 : Concept Builder
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  6. Let a(n) be the nth term of an AP, if sum(r=1)^(100)a(2r)=alpha " and ...

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  7. The 10th common term between the series 3+7+11+ . . . And 1+6+11+ . . ...

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  8. If Sn denote the sum of first n terms of an A.P. whose first term is a...

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  9. If the angles A lt B lt C of a triangle are in A.P, then

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  10. If a1, a2, a3, be terms of an A.P. if (a1+a2++ap)/(a1+a2++aq)=(p^2)/(...

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  11. If(5+9+13+....to n terms)/(7+9+11+....to(n+1) terms)=17/16, then n=

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  13. If a1,a,a3...an are in A.P then prove that a1^2-a2^2+a3^2-a4^2+....a(2...

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  14. If cos x = b.For what b do the roots of the equation form an A.P.?

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  15. 25 trees are planted in a straight line 5 metre apart from each other....

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  17. If a1,a2,a3,...,a(n+1) are in A.P. , then 1/(a1a2)+1/(a2a3)....+1/(ana...

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  18. At what values of parameter a are there values of x such that the numb...

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  19. Let Tr be the r^(th) term of an A.P whose first term is a and common d...

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  20. Find the number of common terms to the two sequences 17,21,25,...,417 ...

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