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Question

Let p,q be integers and let α,β be the roots of the equation, x2x1=0, where αβ. For n=0,1,2,... let an=pαn+qβn.
FACT : If a and b are rational numbers and a+b5=0, then a=0=b.
a12=

A
a11a10
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B
a11+a10
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C
2a11+a10
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D
a11+2a10
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