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tmua.me Medium Set C Paper 1 · Q6

Paper 1Sequences & series

A sequence is defined by u1=2u_1=2 and

un+1=un2+5(n≥1).u_{n+1}=\sqrt{u_n^2+5}\qquad(n\geq1).

What is the least value of nn for which un>8u_n>8?

A1212
B1313
C1414
D1515
E33

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