Question

To be calculated: 1+4+7+...+31=?
the result is 176 but i don't know the formula
Can anyoane help me?

Answer 1

yes, do you know about arithmetic series ?

Answer 2

i know a little bit but this is with an uneven number of items

Answer 3

so, can you find the common difference = d = ... ?
and number of terms = n = ... ?

Answer 4

perfect, I found the sepsone :)

Answer 5

so, you had the formula too and could solve this ?
nice :)

Answer 6

i found it on google after you told me the name of this exercise type

Answer 7

but can you solve similar problems on yur own ?

Answer 8

yes, thanks