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If (3+5+7+ u p tont e r m s)/(5+8+113 u...

If `(3+5+7+ u p tont e r m s)/(5+8+113 u p to10t e r m s)=7,` then find the value of `ndot`

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Given `(3+5+7+… n tems)/(5+8+11+…10 terms) = 7`
Consider (3+5+7+… n tems)
This is an AP with `a = 3 and d = 2`
Sum of n terms `= (n/2)(2a+(n-1)d)`
...
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RD SHARMA-ARITHMETIC PROGRESSIONS-Solved Examples And Exercises
  1. If in an A.P. the sum of m terms is equal of n and the sum of n ter...

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  2. The first , second and the last terms of an A.P. are a ,b , c respect...

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  3. If (3+5+7+ u p tont e r m s)/(5+8+113 u p to10t e r m s)=7, then find...

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  4. In a factory, 150 workers were engaged to finish a piece of work in a ...

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  5. Prove that the sum of n arithmetic means between two numbers in n ti...

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  6. If a ,b ,c are in A.P., then prove that: (a-c)^2=4(b^2-a c), a^3+...

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  7. If a^2(b+c),b^2(c+a),c^2(a+b), are in A.P. show that either a ,b ,c ar...

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  8. If n arithemetic means are inserted between 20 and 80 such tht the r...

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  9. Along a road lie an odd number of stones placed at intervals of 10 met...

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  10. A carpenter was hired to build 192 window frames. The first day he mad...

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  11. In a potato race 20 potatoes are placed in a line at intervals of 4m e...

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  12. We know that the sum of the interior angles of a triangle is180^0 . S...

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  13. 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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  14. Divide 32 into four parts which are in A.P. such that the product of ...

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  15. If theta1,theta2,theta3, ,thetan are in AP, whose common difference ...

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  16. If (m+1) term of an A.P. is twice the(n+1) th term, prove that (3m+1) ...

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  17. If a1,a2,a3, ,an are in A.P. with common difference d(w h e r ed!=0), ...

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  18. If an A.P. is such that (a4)/(a7)=2/7, find (a6)/(a8) .

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  19. The 4th term of an A.P. is three times the first and the 7th term e...

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  20. Find the number of terms common to the two AP's 3,7,11,15.... 407 and...

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