29. If `a = 2i-3j + k, b=-i+k, c = 2j-k,`then`a+b , b+c` is the daigonals of a parallelogram t...

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29. If `a 0:03:03

29. If `a = 2i-3j + k, b=-i+k, c = 2j-k,`then`a+b , b+c` is the daigonals of a parallelogram t...

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