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if a=3 i - 2j + k and b= 2 i + j find a.b

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if a=3 i - 2j + k and b= 2 i + j find a.b
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a=3i-2j+k

b= 2i+j

a. b= 3.2+(-2).1+1.0

= 6-2+0

= 4
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