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od 1 do 99 śr. arytmetyczna = 49,34
( dodawałam też 100 jaak i 99 )
(2 +4 + 6...+ 100) = 2550 : 50 = 51
Nie parzyste:
(1 + 3 + 5 ... +99) = 2550 : 50 = 51