What least number of terms of the sequen...

What least number of terms of the sequence 17, `15 4/5 , 14 3/5 `should be taken so the sum is negative.

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`S_n=n/2(2a+(n-1)d)`
`=n/2((a+l)/2)`
`s_n<0`
`(a+l)/2<0`
`2a+(n-1)d<0`
`2aL-(n-1)d`
`2aL-(n-1)d`
`34L-(n-1)-6/5`
...

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