If the right circular cone is separated into three solids of volume \( v_{1}, v_{2}, v_{3} \) by...

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If the right circular cone is separated into three solids of volume \( v_{1}, v_{2}, v_{3} \) by two planes parallel to the base and trisect the altitude, then \( v_{1}: v_{2}: v_{3} \) is
a. \( 1: 2: 3 \)
b. \( 1: 4: 6 \)
c. \( 3: 2: 1 \)
d. \( 1: 7: 19 \)
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