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If O\ a n d\ O^(prime) are circumcentre ...

If `O\ a n d\ O^(prime)` are circumcentre and orthocentre of `\ A B C ,\ t h e n\ vec O A+ vec O B+ vec O C` equals
a.`2 vec O O '` b. ` vec O O '` c. ` vec O ' O` d. `2 vec O ' O`

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RD SHARMA ENGLISH-ALGEBRA OF VECTORS-All Questions
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