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To get from 2 to 5 you are multliplying 2 by 2 and adding 1. The difference is 3.

Now, to get from 5 to 11 you do the same thing - multipy 5 by 2 and add 1 to get 11. That's what you do to 23. Multlipy by 2 and add 1 to get 47.

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