#"figure-1"#

#"the points C,E,G are the same points(colored red)"#

#"the points A,D are the same points(colored blue)"#

#"the points F,B are the same points(colored green)"#

#"simplify the figure-1 like figure-2"#

#"figure-2"#

#C_1,C_2,C_3" have connected as parallel"#

#C_1,C_2,C_3 rArr C_A=C+C+C=3C#

#C_4,C_5,C_6 " have connected as parallel"#

#C_3,C_4,C_5 rArr C_B=C+C+C=3C#

#C_A and C_B " have connected as serial"#

#C_("AB")=(3C)/2#