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Dec. 15, 2012 - Mathematics on a blackboard (Credit Image: © Image Source/ZUMAPRESS.com)

Filename: 20121215_baf_i19_240.jpg
Copyright: © Image Source RealTime Images
Image Size: 5700x3800 / 2.9MB; www.zumapress.com; zkona black color blackboard classroom college copy space equation finance image source indoors lesson mathematics nobody orthographic text photograph university wall white zselect zagency sf009 025
Contained in galleries: Business Stock - Sep 2018

Dec. 15, 2012 - Mathematics on a blackboard (Credit Image: © Image Source/ZUMAPRESS.com)