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Q: In the sequence 20 1 18 4 13 why are the next two numbers 6 and 10?

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10

1+10 - 2 (2 is one less than 3, the next answer in the sequence) = 9. 10 + 3 - 8 (8 is one less than 9) = 5 3 + 9 - 4 = 8 etc...; so the next two numbers in the sequence will be 11 and 5.

Double it every time and so the next number will be 80

22.5, 33.75, 50.625...

The next number in the sequence is 480

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10

It is necessary to define "next" before the question can be answered.

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6 and 10

6 and 10

1+10 - 2 (2 is one less than 3, the next answer in the sequence) = 9. 10 + 3 - 8 (8 is one less than 9) = 5 3 + 9 - 4 = 8 etc...; so the next two numbers in the sequence will be 11 and 5.

Double it every time and so the next number will be 80

22.5, 33.75, 50.625...

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