Two circular dises of radii 4.5 cm and 2...

Two circular dises of radii 4.5 cm and 2 cm are fixed to astring of length 10 cm as shown.Then the diameter of another disc which touches the circular dises at P and Q is:

A

6.5 cm

B

2.5 cm

C

1.75 cm

D

3.5 cm

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The correct Answer is:

D

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