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Question

Explain the pattern rule.
a) -2,4,-8,16,-32
b) -15,30,90,-360
11 years ago

Answers

Steve
(a) each number is -2 times the previous
(b) I suspect a typo, since the signs do not alternate. However, a rule which works is that the nth term is n times the previous term, with sign changing when (n-1) is a multiple of 3.
11 years ago

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