91Ó°ÊÓ

The game of bridge is played by $4$players, each of who is dealt $13$cards.

There are $26$ways to fill the first place, and for each choice, there are$26$ways to fill the second place. That is, there are$26×26$ways to fill the first two places. And for each choice of those, we have $10$ways to fill the third place, and for every choice, we have $10$ways to fill the fourth place... and so on.

From the generalized basic principle of counting, there are$26×26×10×10×10×10×10$ways to generate a license plate.

In the first place, there are $26$ways to fill it.

For every choice of the first place, there are $25$ways to fill the second place.

For every choice of the first two places, there are$10$ways to fill the third place.

For every choice of the first three places, there are $9$ways to fill the fourth place.

For every choice of the first four places, there are $8$ways to fill the fifth place.

For every choice of the first five places, there are $7$ways to fill the sixth place.

For every choice of the first six places, there are $6$ways to fill the seventh place.

From the generalized basic principle of counting, there are$26×25×10×9×8×7×6$ways to generate a license plate.

$$\begin{gathered} \left(a\right)26×26×10×10×10×10×10 \\ \left(b\right)26×25×10×9×8×7×6 \end{gathered}$$