Question 858278
a = t * r^(n-1),
b = t * r^(n),
c = t * r^(n+1),
a+b+c=26,
a*b*c=216
a=2,   b=6,   c=18,   r=3,   t1=6
or
a=18,   b=6,   c=2,   r=1/3,   t1=18