A mathematician has devised a theorem that produces a series of numberss1,s2…sxaccordingtotheprincipless1=2,s2=2,s3=2, and for x ≥ 4,sx=2s(x–1)+s(x–2). Which of the following equals s_6 ?
A.30
B.34
C.37
D.38
E.40
我的答案:
A mathematician has devised a theorem that produces a series of numbersfff\(s_1,s_2…s_xaccording to the principless_1=2,s_2=2,s_3=2\)/fff, and for x ≥ 4,fff\(s_x=2s_(x–1)+s_(x–2)\)/fff. Which of the following equals s_6 ?