[" 51) If "alpha,beta" be the roots of "...

[" 51) If "alpha,beta" be the roots of "x^(2)-x-1=0" and "A_(n)=alpha^(n)+beta^(n)," then "AM],[" of "A_(n-1)" and "A_(n)" is "],[[" Xa) "2A_(n)+1," (b) "(1/2)A_(n)+1],[" Xc) "2A_(n-2)," Xd) None of these "]]

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