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Determine the values of a and b for whic...

Determine the values of a and b for which the straight line joining the points A(3, 4, -1) and B(4, a, 2) is parallel to the straight line joining the points P(2, 1, b) and Q(4, -3, 1).

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The correct Answer is:
`a=2` and `b=-5`
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