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0
166
1
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a4 = ?

a1 = 1

a2 = 9

an = 5 * an-2 - an-1

Guest Apr 17, 2017
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 #1
avatar+26357 
+1

a1 = 1

a2 = 9

a3 = 5*1 - 9 = -4

a4 = 5*9 - (-4) = 49

.

Alan  Apr 17, 2017

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