Question 1141964: 3,-6,12,4,20,?
Answer by greenestamps(13200)   (Show Source):
You can put this solution on YOUR website!
ANSWER: Any number you want.
Put any number next and it will be a valid sequence.
We can assume that the author of the problem used a logical pattern to form the given sequence of numbers. But in virtually all cases there are other very different patterns that will produce the same given numbers but different next numbers.
Without any additional information given about what kind of sequence this is supposed to be, any effort in finding a solution is, in the end, a waste of time, because any logical solution you find might not be the "right" one.
Spend a minute or two at the most seeing if you can find a possible answer; but don't lose any sleep over it.
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