Show that PQ and RS are parallel where P, Q, R, S are two points (2, 3, 4), (4, 7, 8), (-1, -2, 1) and (1, 2, 5).
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i have no answer for your question
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I have answer but not remember
Step-by-step explanation:
There appears to be a pattern emerging. 1,3,6 are the first three triangular numbers.
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