Q: The sequence a1,a2,...,an is such that an= 4*a(n-1) -3 for all integers n>1.
If a3=x, then a1=
A. 4x- 3
B. 16x-15
C. (x+3)/4
D. (x+3)/16
E. (x+15)/16
Ans: E
我選了C:
a3= 4a1-3 = x
所以a1 = (x+3)/4
how come the answer is E?!
--
※ 發信站: 批踢踢實業坊(ptt.cc)
◆ From: 61.66.187.115