The next number in the sequence is 20. You are alternately multiplying the previous number by two and then subtracting two.
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What would be the next number in this series 15 12 13 10 11 8?
22
It is 7. 100-52 = 48, 52-28 = 24, 28-16=12, 16-10=6 and therefore the next number you subtract by is 3, so 10-3=7.
In a number series, you must figure out the "pattern" in order to say what will be the next number. For example, in each of the following number series, say what is the pattern, and what is the next number. 1. 1 3 5 7 Answer: The pattern is to increase the previous number by 2, and the next number is 9. 2. 3 10 31 94 Answer: The pattern is to multiply the previous number by 3, then add 1, and the next number is 283. 3. 100 10 1 0.1 Answer: The pattern is to divide the previous number by 10, and the next number is 0.01.
Each following number in the sequence is being divided by 4. Therefore, the next number in the sequence is 3/4 = 0.75.