Respuesta :
a) (18,12), (19,12), (20,12)
b) (16,12), (14,12), (15,12)
c) (17,13), (17,14), (17,15)
d) (17,11), (17,10), (17,9)
b) (16,12), (14,12), (15,12)
c) (17,13), (17,14), (17,15)
d) (17,11), (17,10), (17,9)