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Cat face: 103+206+309+..............................................+5253= ( rezolare )

Răspuns :

103 + 206 + 309 + ......+ 5253 =
n = ( 5253 - 103) : ( 206 - 103 ) +1
n = 5150 : 103 + 1
n = 50 + 1
n = 51

S = [(5253 + 103 ) x 51 ] : 2
S = ( 5356 x 51 ) : 2
S = 273156 : 2
S = 136578.
103+206+309+..............................................+5253=
=103(1+2+3+.....+51)=
=103*51*52/2=
=103*51*26=
=136578