a and b are a+b=2i+6j+k and a-b=4i+2j-11k
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here is the answer to the question
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solving two equation we get
2a=6i+8j-10k
a=2(3i+4j-5k)/2
a=3i+4j-5k
substitute a value in first equation
3i+4j-5k+b=2i+6j+k
b=2i+6j+k-3i-4j+5k
b=-i+2j+6k
2a=6i+8j-10k
a=2(3i+4j-5k)/2
a=3i+4j-5k
substitute a value in first equation
3i+4j-5k+b=2i+6j+k
b=2i+6j+k-3i-4j+5k
b=-i+2j+6k
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