Question: 1. The digits { 0, 1, 2, 3, 4, 5} will be used to form a four-digit code. How many codes can be formed if

1. The digits { 0, 1, 2, 3, 4, 5} will be used to form a four-digit code. How many codes can be formed if repeated digits are allowed?

2. A gift shop sells t-shirts that are available plain or with one of 5 designs screen-printed on the back of the shirt. The t-shirts are available as long- or short-sleeve and come in 8 colors. How many different t-shirts does the gift shop sell?

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