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Veamos
42 ( ? ) 64 ⇒ 4 + 2 + 6 + 4 =16 ; ? = 16
44 (13) 32 ⇒ 4 + 4 + 3 + 2 = 13
53 (24) 97 ⇒ 5 + 3 + 9 + 7 = 24