If a=i+j+k,b=2i-j+3k find a.b
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a=i+j+k,b=2i-j+3k then
a. b=2-1+3=4
a. b=2-1+3=4
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a.b = (i+j+k).(2i-j+3k)
= 2i-j+3k
= 2i-j+3k
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