What is the face value of $21$ in $2021$ ?

21

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2

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1

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None of the above

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Solution

The correct option is D None of the above
Face value is defined for only single digits but $21$ has two digits. Therefore, the face value of $21$ in $2021$ is not defined.
$(d)$ is the correct choice.

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⎡ ⎢ ⎣ \begin{matrix} 1 & 0 & 2 - 1 & 1 & - 2 0 & 2 & 1 \end{matrix} ⎤ ⎥ ⎦ + ⎡ ⎢ ⎣ \begin{matrix} 5 & 1 & - 2 1 & 1 & 0 - 2 & - 2 & 1 \end{matrix} ⎤ ⎥ ⎦

^{2021} C_{2020}

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