Find the Dimensions of the Matrix $B = \left[ \begin{array} { c } \frac { 2 } { 3 } \\3 \\0 \\- \frac { 4 } { 7 }\end{array} \right]$

question 164

Multiple Choice

Find the dimensions of the matrix $B = \left[ \begin{array} { c } \frac { 2 } { 3 } \\3 \\0 \\- \frac { 4 } { 7 }\end{array} \right]$
And identify the value of the element $b _ { 21 }$ .

• A) \(1 \times 4\) ; \(b _ { 21 } = 3\)
• B) \(4 \times 1\) ; \(b _ { 21 } = 3\)
• C) \(1 \times 4\) ; \(b _ { 21 } = - \frac { 4 } { 7 }\)
• D) \(4 \times 1\) ; \(b _ { 21 } = 0\)
• E) \(1 \times 4\) ; \(b _ { 21 } = \frac { 2 } { 3 }\)

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