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Two circles touch each other externally at `P` . `A B` is a common tangent to the circle touching them at `A` and `B` . The value of `/_A P B` is `30o` (b) `45o` (c) `60o` (d) `90o`

A

`30^@`

B

`45^@`

C

`60^@`

D

`90^@`

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D
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