Answer:
Skip counting but In Subtraction.
Explanation:
Do you guys see the numbers -4,-8,-12,and -16. Well it's subtracting by 4.
For example, 4+4= 4 × 2
4 x 1 is 4, 4 x 2 is 8, and etc...
a(n)= -4 + a(n-1)
a1=-4
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