SOLUTION: what is the sum of all of these? 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 isnt there like a technique? :D

Algebra ->  Sequences-and-series -> SOLUTION: what is the sum of all of these? 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 isnt there like a technique? :D      Log On


   

Question 844478: what is the sum of all of these? 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30
isnt there like a technique? :D
Found 2 solutions by Fombitz, Alan3354:
Answer by Fombitz(32388) About Me  (Show Source):
Answer by Alan3354(69443) About Me  (Show Source):
You can put this solution on YOUR website!
Pair them from the outside in
1 + 30 = 31
2 + 29 = 31
3 + 28 = 31
etc
you get 15 pairs
15*31 = 465