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#problems #series #mathematicalreasoning I hope you like it for more content (MATERIALS, BLACKBOARDS, MEMES, etc.) enter here ... Facebook ► / preparatoryzeus Whatsapp ► 96431863 Find the sum of: 7 + 77 + 777 + .... + 777 ... 77 find the sum of: 4 + 44 + 444 + ... + 444 ... 44 find the sum of: 9 + 99 + 999 + ... + 999 ... 99