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bilangan prima setelah 17 adalah 19
19/17-17/19=361/323-289/323=72/323
bilangan prima setelah x = y (berarti y = bilangan prima setelah 17 = 19)
jadi x = 17 dan y = 19
y/x - x/y = 19/17 - 17/19
= 19kali19 - 17kali17 / 17kali19
= 361 - 289 / 323
= 72 / 323