The four tiles shown in Figure are used in Exercise. In this situation, tiles may not be f...

The four tiles shown in Figure are used in Exercise. In this situation, tiles may not be flipped or rotated when used to cover a given figure. For example, tile U will always have its dot in the up position.

Figure

Exercise

(a) How many ways can tile U be placed in rectangle B?

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(b) How many ways can tile R be placed in rectangle B?