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[" 31.If "x=sqrt(1+sqrt(1+sqrt(1+..........

[" 31.If "x=sqrt(1+sqrt(1+sqrt(1+.......00)))" then "x" is equal to : "],[[" (a) "(1+sqrt(5))/(2)," (b) "(1-sqrt(5))/(2)," (c) "(1+-sqrt(5))/(2)," (d) "" None "],[" these "]]

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