Respuesta :
"Which ... " undoubtedly means "Here are some choices. Pick
the correct one.". Sadly, you decided not to tell us the choices.
There are an infinite number of them.
Here are a few:
(3, 2)
(6, 6)
(9, 10)
(12, 14)
(15, 18)
(18, 22)
(21, 26)
(333, 442)