volume one
CDBAB DDACB
(-1+ radical number 5)/2 5 9 6
q=2 n=8
t=( 1/7)*(8^(n+ 1)- 1)
Volume II
CCCB
((-1+ radical number 5)/2, (1+ radical number 5)/2) 4 or 5/2.
an=2^n t=2+(n- 1)*2^(n+ 1)
an=2^(n- 1)s=(4^(n)- 1)/3+(n^(2)-n)/2
There is no process, dear ~ do it yourself! For reference, the sixth issue gives the answer. ...
The first line is a single choice.
The second line is to fill in the blanks
The third line is the first big question.
The fourth line is the second big problem.
Ps: I can't type mathematical symbols, so I'm just looking…… around ~ (pointing to my ing ..............)