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tmua.me Medium Set B Paper 1 · Q12

Paper 1Sequences & series

A geometric progression has positive terms u1,u2,u3,…u_1,u_2,u_3,\ldots and satisfies

u1+u2+u3=21,u4+u5+u6=168.u_1+u_2+u_3=21,\qquad u_4+u_5+u_6=168.

What is the value of u12+u22+u32u_1^2+u_2^2+u_3^2?

A189189
B2121
C6363
D147147
E441441

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