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OpenStudy (anonymous):
If A= 2i+4j+5k and B=-2i+2j+k. then A.B is ??
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OpenStudy (anonymous):
A.B=(2i+4j+5k).(-2I+2J+K) \[=\left( 2 \right)\left( -2 \right)+\left( 4 \right)\left( 2 \right)+\left( 5 \right)\left( 1 \right)\] =-4+8+5 =9
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