SOLUTION: Given the sequence 5,8,11 find the sum from the 13th to 53rd numbers inclusive

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Question 1104646: Given the sequence 5,8,11 find the sum from the 13th to 53rd numbers inclusive


Answer by Fombitz(32388) About Me  (Show Source):
You can put this solution on YOUR website!
First value : 5
Difference between values : 3
.
.
.
S%5Bn%5D=%28n%2F2%29%282a%5B1%5D%2B%28n-1%29d%29
So,


So then,
S=S%5B53%5D-S%5B12%5D=4399-258=highlight%284141%29