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A parallelogram is constructed on 3 v...

A parallelogram is constructed on `3 vec a+ vec ba n d vec a-4 vec b ,w h e r e| vec a|=6a n d| vec b|=8,a n d vec aa n d vec b` are anti-parallel. Then the length of the longer diagonal is `40` b. `64` c. `32` d. `48`

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