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Which of the following is the correct rule for the sequence 1, 2, 2, 4, 8?

a1=1, a2=2, an=an-1-an-2

a1=1, a2=2, an=an-1+an-2

a1=1, a2=2, an=2an-1 an-2

a1=1, a2=2, an=an-1 an-2