Let a,b,c be in AP and |a|<1, |b|<1, |c|<1. If x=1+a+a^2+ to , y=1+b+b^2+ to and z=1+c+c^2+ , then x,y,z are in

JEE Main Mathematics question

Let be in AP and , , . If to , to and , then are in

Answer: (C)

, , , so , , . Since

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Question ID VK-021512