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Mathematics 13 Online
OpenStudy (alprincenofl):

The sum of 1+2+3+…+25 ?

jimthompson5910 (jim_thompson5910):

use the formula 1+2+3+...+n = n*(n+1)/2

OpenStudy (alprincenofl):

http://prntscr.com/57sonq

OpenStudy (alprincenofl):

b) 325 Thanks

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