Mathematics: License plate consists of 4 letters followed by 3 digits. how many license plates are possible if the 1st letter can t be o, and letters and digits may repeat.

License plate consists of 4 letters followed by

Ответ:

losstdr3ams

29.07.2019

$25 \cdot 26 \cdot 26 \cdot 26 \cdot 10 \cdot 10 \cdot 10 = 439,400,000$ 26 letters in total, but first letter cannot be o so 25 letters for the first slot. the rest of the letters, 26 a permitted.there are 10 digits in total (0-9), so 10 in the slots for numbers