Show that the points whose position vectors are `(5hat(i) + 6 hat(j) + 7 hat(k)),

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Show that the points whose position vectors are `(5hat(i) + 6 hat(j) + 7 hat(k)), ( 7 hat(i) - 8hat(j) + 9 hat(k)) and (3 hat(i) + 20 hat(j) + 5 hat(k))` are collinear.
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