# State whether the expression is meaningful. If not, explain why? If so, state whether it is a vector or a scalar: abcd(a¯×b¯).(c¯×d¯) - Mathematics and Statistics

Sum

State whether the expression is meaningful. If not, explain why? If so, state whether it is a vector or a scalar:

(bar"a" xx bar"b").(bar"c"xxbar"d")

#### Solution

This is scalar product of two vectors. Therefore, this expression is meaningful and it is a scalar.

Concept: Vectors and Their Types
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