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recursive formula
Write a recursive formula for the sequence 15, 26, 48, 92, 180,.... Then find the next term
Step 1: 48 is twice 26, then subtract 4. 92 is twice 48 then subtract 4, 180 is twice 92 then subtract 4.
Step 2: so if you are on number n, you can get to the next number by doing 2n-4.
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