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2 6 10 -> 2(2)+6=4+6=10
4 12 X -> 4(2)+12= 8+12=20
"X" vale 20
1+2=3 3+2=5
En la segunda secuencia
2+4=6 6+4=10
En la tercera
4+8=12 12+8=x
x=20
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