Question

the sum of first 12 term of an ap is - 102 and the first term is 8 find the 30 term​

Answer 1

Question ⤵

the sum of first 12 term of an ap is - 102 and the first term is 8 find the 30 term?

Answer ⤵

First term of AP = a = -19 and last term = l = 36

Number of terms = n = 12

$sum \: of \: ap \: = \frac{n}{2} (a + l)$

$= \frac{12}{2} ( - 19 + 36)$

$= 17 \times 6$

$= 102$

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