Consider the vectors ā = 2i+3- k, č = i+ j+3k d = 21-j+ k, j = -21- j+ k. Which pairs (if any) of these vectors are (a) Are perpendicular? (Enter none or a pair or list of pairs, eg, if ä is perpendicular to b and č, enter (a,b),(a,c),) (b) Are parallel? (Enter none or a pair or list of pairs, eg, if ā is parallel to b and č, enter (a,b),(a,c).) (c) Have an angles less than 7/2 between them? (Enter none or a pair or list of pairs, e.g, if ā is at an angle less than pi/2 from b and č, enter (a,b),(a,c).)

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