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Explanation:

Points P and Q have the same Y coordinate but their X coordinates differ by 6 units (Since the diameter = 6 units)

We have two possible cases:

Case 1:

y=ax=2a(x+6)

a=(1/2)16

Case 2:

y=2ax=a(x+6)

a=(2)16

But it is given that a < 1

∴ Case 2 can be discarded

Hence, option (a).

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