Which term of the ap 21 18 15 is


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Which term of an ap 21 18 15 ........is -18

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here \: is \: your \: answer

 a_{n} =  - 18 \\ a = 21 \\ d =  - 3 \\   a_{n} = a + (n - 1)d \\  =  >   - 18 =21 + (n - 1) - 3 \\

 =  >  - 39 = (n - 1) - 3 \\  =  >  \frac{ - 39}{ - 3}  = n - 1 \\  =  > 13 = n - 1 \\  =  > n = 14

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