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a) (a . b) . c - meaningless, scalar • vector

b) (a . b)c - meaninful , (scalar)vector

c) |a| (b . c) - meaningful, (scalar)(scalar)

d) a . (b + c) - meaningful, vector • vector

e) a . b + c - meaninless, scalar + vector

f) |a| . (b + c) - meaningless, scalar • scalar