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Question
Choose the correct alternative:
One of the diagonals of parallelogram ABCD with `vec"a"` and `vec"b"` as adjacent sides is `vec"a" + vec"b"`. The other diagonal `vec"BD"` is
Options
`vec"a" - vec"b"`
`vec"b" - vec"a"`
`vec"a" + vec"b"`
`(vec"a" + vec"b")/2`
Solution
`vec"b" - vec"a"`
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