Question

Which expression defines the arithmetic series 2.3 + 2.6 + 2.9 + for five terms

Answer 1

Answer:

Option C is the answer.

Step-by-step explanation:

Given arithmetic series is 2.3 + 2.6 +2.9 + ......... 5 terms

Since this series is an arithmetic series so explicit formula of series will be $\sum_{n=1}^{n}[a+(n-1)d]$ where a is the first term, d is the common difference and n is the number of term.

Therefore, we replace the values a = 2.3, and d = (2.6 - 2.3) = (0.3)

expression will be $\sum_{n=1}^{n}[2.3+(n-1)(0.3)]$

$\sum_{n=1}^{n}[2.3+(0.3)n-0.3]$

$\sum_{n=1}^{n}[2+(0.3)n]$

Option C is the answer.

Answer 2

Answer:

so a sub n=2.3+(n-1)0.3

That's in an arithmetic sequence