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if (3 +5+7+9+…. " up to 35 terms " )/(5...

if ` (3 +5+7+9+…. " up to 35 terms " )/(5+8+11+ …. " up to n terms ")=7` , find the value of n.

Text Solution

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The correct Answer is:
n=10
`(35/2.{6+34xx2})/(n/2.{10 +(n-1) xx3}) =7 Rightarrow 3n^(2) +7n -370 =0`
` Rightarrow (3n +37) (n-10) =0 Rightarrow n=10`
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