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Mathematical series question

A virus infects 2 additional people every 2 days over 6 weeks.
Create appropriate mathematical series.

Show the formula for the nth term.
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1420787
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Day 1:
Day 2:
Day 3:
Day 4:

Day n:

Fill in the number for each of days 1 to 4 then see if you can think of how to get from the day to the number infected. Can you write that as a little expression in terms of n?

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