Answer:
1. 360
2. 17,576,000
Step-by-step explanation:
1.
Assume you can use each letter only once. You are making 4-letter words. For the first letter, you can choose from the 6 letters. For the second letter, you can choose from the remaining 5 letters. For the third letter, you can choose from the remaining 4 letters. For the fourth letter, you can choose from the remaining 3 letters.
6 * 5 * 4 * 3 = 360
2.
For each of the letter, you can choose from 26 letters. For each of the digits, you can choose from 10 digits.
26 * 26 * 26 * 10 * 10 * 10 = 17,576,000
