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Find the 0 where the AP is 40,37,......

Find the 0 where the AP is 40,37,...

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The `n^(th)` term of an `A.P`
`a_n​=a+(n−1)d`
`=>a+(n−1)d=0`
Here `a=40,d=37−40=−3`
`=>40−3(n−1)=0`
`=>40=3(n−1)`
...
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