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If in a right-angled triangle `A B C ,` the hypotenuse `A B=p ,t h e n vec A BdotA C+ vec B Cdot vec B A+ vec C Adot vec C B` is equal to `2p^2` b. `(p^2)/2` c. `p^2` d. none of these

A

`2p^(2)`

B

`p^(2)/2`

C

`p^(2)`

D

None of these

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The correct Answer is:
C
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