If a right circular cone is separated into solids of volumes $v_{1}$, $v_{2}$, $v_{3}$ by two planes parallel to the base, which also trisect the altitude. then, $v_{1}:v_{2}:v_{3}$ is

If a right circular cone is separated into solids of volumes $v_{1}$, $v_{2}$, $v_{3}$ by two planes parallel to the base, which also trisect the altitude. then, $v_{1}:v_{2}:v_{3}$ is
1). 1:2:3
2). 1:4:6
3). 1:6:9
4). 1:7:19

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