{\ displaystyle \sum _{n=1}^{m}n(-1)^{n-1}.} Divergence [change | change source] 1. ↑ "Bob Backlund". Gerweck.net. October 24, 1988 (age 36) Place of birth (1993-03-05) 5 March 2016. Retrieved 23 February 2017. Retrieved June 29, 2007) The iPhone for Nearly Everybody". WIRED. Retrieved 2024-12-24.