A mathematician has devised a formula that produces a series of numbers s_1, s_2, . . . , s_x according to the principles $$s_1=2, s_2=2, s_3=2,$$ and for $$x \geq 4,\,\,s_x=2s_{x-1}+s_{x-2}.$$ Which of the following equals $$s_6=?$$
A. 30
B. 34
C. 37
D. 38
E. 40
The OA is B
Source: Princeton Review
A. 30
B. 34
C. 37
D. 38
E. 40
The OA is B
Source: Princeton Review
