a1+a4+a7+……+a97=200 (1)
a2+a5+a8+……+a98=M (2)
a3+a6+a9+……+a99=N (3)
(2)/(1)
q=M/200=1/2 M=100
(3)/(2)
q=N/M=1/2 N=50
a3+a6+...+a99=50
a1+a4+a7+……+a97=200 (1)
a2+a5+a8+……+a98=M (2)
a3+a6+a9+……+a99=N (3)
(2)/(1)
q=M/200=1/2 M=100
(3)/(2)
q=N/M=1/2 N=50
a3+a6+...+a99=50