PLEASE HELP WILL MEDAL!!! (ans. must be correct)

Here is a series written in expanded form:

3 + 8 + 13 + ... + 33

Which of the following summation notations represents this series?

Question

PLEASE HELP WILL MEDAL!!! (ans. must be correct)

Here is a series written in expanded form:

3 + 8 + 13 + ... + 33

Which of the following summation notations represents this series?

anonymous · Answer

attachment

ganeshie8 · Answer

its an arithmetic series, start by finding the $n$th term

anonymous · Answer

nth?

ganeshie8 · Answer

yes what formulas do u remember about arithmetic series ?

ganeshie8 · Answer

$3 + 8 + 13 +  \cdots + 33$

ganeshie8 · Answer

look at the series ^
can u tell me below :
first term = ?
common difference = ?

anonymous · Answer

5 is the common difference
3 is the first terms

ganeshie8 · Answer

sorry i was not getting notifications :/

yes !
so the nth term is given by :
$\large a_n = a_1 + (n-1)*d$
$\large ~~~ =   ?$

anonymous · Answer

@moemand if you used the first answer and replaced i with 1,2,3,4,5,6,7
then do u get this series?

anonymous · Answer

i guess what u need to mindful of when choosing the answer is the range, is it from 1 to 5 or to 6 or to 7?

anonymous · Answer

how can you get 33?
5*7 - 2 = 33
7 is the 7th term of the series that @ganeshie8  was explaining to you