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What maths sequences can you start with 4 and 8?

Updated: 8/18/2019
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13y ago

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one rule would be an+1 = an + 4 ; a0= 4. This gives 4,8,12,16,20,.....

This is called an arithmetic sequence.

A geometric rule would be an+1 = 2an; a0= 4. This gives 4,8,16,32,64,...

Another rule is an+1 = an/2 + 6 ; a0= 4. This gives 4, 8, 10, 11, 11.5,11.75, ....

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Q: What maths sequences can you start with 4 and 8?
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