How many terms of an A.P: -6, -11/2, -5 ...... are needed to get the sum -25 ?

The given A. P. is

Here first term, *a* = –6,

Let sum of *n* terms of the given A. P. is –25

Hence sum of first 5 terms and sum of first 20 terns will be –25.

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How many terms of an A.P: -6, -11/2, -5 ...... are needed to get the sum -25 ?

The given A. P. is

Here first term, *a* = –6,

Let sum of *n* terms of the given A. P. is –25

Hence sum of first 5 terms and sum of first 20 terns will be –25.

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