It could be 9 or it could be 12. Depending on how they are being figured.
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1
The next number is 13... you're adding the previous two numbers together to produce the next in line.
Answer = 21 The next number is the previous 2 numbers added together
This sequence is the squaring of the numbers 1, 3, 5, and 7. The next number is 9^2 = 81.
1/2 then 1/4 1/8 1/16 1/32