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2, 3, 5, 8, 11, 12, 13, 20, 21

2, 3, 5, 8, 11, 12, 13, 20, 21-example-1
User Jboot
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2. 2n-5=7
+5+5 no makes it 2n=12 do 12/2 and you get 6 and thats your answer hope i helped

User J Bourne
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