Question

In an ap the first term is -4 the last term is 29 and the sum of all its term is 150

Answer 1

A=-4

An = 29

Sn =150

Sn = n/2(a+an)

150 = n/2 ( -4+29)

150 = n/2(25)

150×2/25 = n

6×2 = n

12 = n

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