SAT Math Practice Question #28205 - SATify | SATify

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SAT Math Practice Question #28205 - SATify | SATify

#28205

sequences and series

algebra

Recurrence Relations

hard

180 sec

Suppose that $(u_{n})$ is a sequence of real numbers satisfying $u_{n + 2} = u_{n + 1} + u_{n}$ and that $u_{3} = 5$ and $u_{6} = 21$ . What is $u_{5}$ ?

A.

11

B.

12

C.

13

D.

14

E.

15