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- P1(7,8,5)\mathrm { P } _ { 1 } ( 7,8,5 )

Question 120

Multiple Choice

 Calculate the direction of P1P2 and the midpoint of line segment P1P2\text { Calculate the direction of } \overrightarrow { P _ { 1 } P _ { 2 } } \text { and the midpoint of line segment } P _ { 1 } P _ { 2 } \text {. }
- P1(7,8,5) \mathrm { P } _ { 1 } ( 7,8,5 ) and P2(15,16,9) \mathrm { P } _ { 2 } ( 15,16,9 )


A) 23i+23j+13k;(11,12,7) \frac { 2 } { 3 } \mathbf { i } + \frac { 2 } { 3 } \mathbf { j } + \frac { 1 } { 3 } \mathbf { k } ; ( 11,12,7 )
B) 73i+83j+53k;(72,4,52) \frac { 7 } { 3 } \mathbf { i } + \frac { 8 } { 3 } \mathbf { j } + \frac { 5 } { 3 } \mathbf { k } ; \left( \frac { 7 } { 2 } , 4 , \frac { 5 } { 2 } \right)
C) 23i+23j+13k;(4,4,2) \frac { 2 } { 3 } \mathbf { i } + \frac { 2 } { 3 } \mathrm { j } + \frac { 1 } { 3 } \mathbf { k } ; ( 4,4,2 )
D) 23i+23j+13k;(152,8,92) \frac { 2 } { 3 } \mathbf { i } + \frac { 2 } { 3 } \mathrm { j } + \frac { 1 } { 3 } \mathbf { k } ; \left( \frac { 15 } { 2 } , 8 , \frac { 9 } { 2 } \right)

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