Question

If the nth partial sum of a sequence an is given by
sum_{k=1}^{n} 2k+4

then what is the 4th term of the sequence?


A. 12
B. 14
C. 6 + 8 + 10 + 12
D. 4

Answer 1

\[\sum_{k=1}^{n} 2k+4\]

Answer 2

hmm...if you want the fourth term you should calculate 6+8+10+12....it's the fourth term of the SUM of the sequence...

Answer 3

36

Answer 4

36

Answer 5

so C is the answer? @nenadmatematika

Answer 6

yes, just it's a bit tricky because the fourth term of the SUM is 36 and the fourth term of the sequence which terms are parts of the sum is 12....