Sequence and series problem

[erfa]

If the sum of 1st n terms of an arithmetic sequence is 300 , the 1st tern is -3 and the 5th term is -1, Find the value of n?

 

[lev888]

If the sum of 1st n terms of an arithmetic sequence is 300 , the 1st tern is -3 and the 5th term is -1, Find the value of n?

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[Steven G]

With respect to arithmetic sequences what is a, d and the 300th term equal to?