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Question

A taper hole is inspected using a CMM, with a probe of 2 mm diameter. At a height, Z=10 mm from the bottom, 5 points are touched and a diameter of the circle (not compensated for probe size) is obtained as 20 mm. Similarly, a 40 mm diameter is obtained at a height Z=40 mm. The smaller diameter (in mm) of hole at Z = 0 is

A
15.542
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B
15.334
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C
13.334
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D
15.442
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