Q.

There are n-AM's between 1 and 31 such that 7th  mean:(n-1) th  mean =5:9 then find the value of n

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answer is 2.

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Detailed Solution

d=31−1n+1=30n+1 According to the question a+7da+(n−1)d=5/9⇒4=5 n-68 30n+1⇒4n+4=150n−2040⇒n=14
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