Mathematics, 10.04.2021 14:00 hudsonlilliana
The entrance of a building is controlled by a code device (box), which has 10 numbers and 4 letters. A code has four elements: two digits and two letters in any order. The two letters must be distinct. How many possible codes is there ?
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The entrance of a building is controlled by a code device (box), which has 10 numbers and 4 letters....
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