Math, asked by salimkhan2443, 1 year ago

Which term of an ap is - 2 - 7 - 12 will be 77 find the sum of the sub to the term 77 -?

Answers

Answered by BEJOICE
1

n =  \frac{tn - t0}{d}  + 1 =  \frac{ - 77 + 2}{ - 5}  + 1 \\ n = 16 \\ sum =  \frac{n}{2} (t0 + tn) \\  =  \frac{16}{2}  \times ( - 2 - 77) =  - 632
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