Question 984929: 3, -6, 12, 4, 20, WHATS NEXT
Answer by rothauserc(4718)   (Show Source):
You can put this solution on YOUR website! 3, -6, 12, 4, 20,
look at the differences to discover the pattern
-9, 18, -8, 16,
the next difference is -7, therefore
20 - 7 = 13
13 is the next number in the sequence
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