Eh macam soalan puzzle ni nak cari missing number dalam arrange ascending order ke? Honestly I'm not sure exactly which numbers you're working with since I can't see the actual problem, tapi normally kita tengok pattern dia, like increment by 2, by 5, whatever, then spot mana yang out of place! Boleh share the actual numbers dengan aku? Then I can help figure out which one is missing, easy je once you see the pattern