Which of the following pairs (a,b)(a, b)(a,b) allows us to find integers xxx and yyy satisfying ax+by=1ax + by = 1ax+by=1?
(12,18)(12, 18)(12,18)
(14,21)(14, 21)(14,21)
(15,28)(15, 28)(15,28)
(20,35)(20, 35)(20,35)