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2014-10-12T11:22:45+03:00

5=4x1+1,9=4x2+1, .....101=4x25+1

25-1=1=25

S=    5+ 9+..........+101

S= 101+97=........+5

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106+106+.........+106 de 25 de ori

106x25=2650

2650:2=1325

Sx3= 1325

S=1325x3=3975