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Mathematics, 19.08.2019 19:30 soccerjessie6846

If a=(-1,1), b=(5,-2), c=(2,3), d=(a,5) and vector ab is parallel to vector dc, find the value of 'a'.

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If a=(-1,1), b=(5,-2), c=(2,3), d=(a,5) and vector ab is parallel to vector dc, find the value of 'a...
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