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4 (12 ) 3
7 ( a ) 4
4x3=12
7x4=28
¿que numero falta?
6 ( 13 ) 1
7 ( ? ) 3
6×2=12+1=13
7×2=14+1=15
en la dos es 17 porque se multiplica 7 por 2 y se le suma 3