a1=2, a2=1, and an+2=2an-an+1
Write out a1 through a5
a1 = 2
a2 = 1
a3 = 2 * 2 - 1 = 3
a4 = 2 * 1 - 3 = -1
a5 = 2 * 3 - (-1) = 7
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