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1° columna :5+4+7+10=26
2° columna: 11+8+5+4= 28
3° columna: 3+6+9+12= 30
4° columna :x+5+4+3=
Si observamos la sucesión aumenta de dos en dos, entonces la 4° columna será 32.
x+5+4+3=32
x+12=32
x=32-12
x=20
Piden hallar:
S= (7"x"2)+(2"x"1)
S= 7202+2201
S= 9403