Question
Two circles of radii 15 cm and 10 cm touch each other
externally at a point A. PQ is the direct common tangent of those two circles of centers O β and O β respectively. The length of PQ is equal toSolution

Select the number from among the given options that can replace the question mark β?β in the following series.
30, 34, 42, 58, β?β, 154
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