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S = 3780
termino 40 : 192
En el tercero:
S = (4 +0 ) +(4 + 3) +(4 + 6)+(4 + 9).....+(4+27)
S = 4×10 + 3×(0 + 1 + 2 + 3 +......+9)
S = 4×10 + 3×(9)(10)/2
S = 175