Write out the first three terms and the last term of the arithmetic sequence.
-$\sum _ { i = 1 } ^ { 17 } ( 4 i + 4 )$
A) $8 + 12 + 16 + \ldots + 72$
B) $4 + 8 + 12 + \ldots + 72$
C) $4 - 8 + 12 - \ldots + 72$
D) $8 + 20 + 52 + \ldots + 276$

Question

Quizplus · Accepted Answer

The given sequence is an arithmetic sequence with the general term $4i + 4$. For the first term, $i = 1$, so the first term is $4(1) + 4 = 8$. The second term, with $i = 2$, is $4(2) + 4 = 12$, and the third term, with $i = 3$, is $4(3) + 4 = 16$. The last term, when $i = 17$, is $4(17) + 4 = 68 + 4 = 72$. Therefore, the sequence is $8 + 12 + 16 + \ldots + 72$.

Write Out the First Three Terms and the Last Term ∑i=117(4i+4)\sum _ { i = 1 } ^ { 17 } ( 4 i + 4 )∑i=117​(4i+4)

Write Out the First Three Terms and the Last Term $\sum _ { i = 1 } ^ { 17 } ( 4 i + 4 )$