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2n+2n+2 ≤· 90
4n ≤ 90-2
4n ≤ 88
n ≤ 22
bilangan tsb:
2n dan 2n+2
2(22) dan 2(22)+2
44 dan 44+2
44 dan 46
jadi, bilangan tersebut adalah x ≤ 44 dan x ≤ 46
x ≤ 44