# Question: hexadecimal digits are 0 1 2 3 4 5 6...

###### Question details

Hexadecimal digits are 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, A, B, C, D, E, and F. (Please explain briefly)

- How many hexadecimal strings of length ten have at least three E’s?
- How many hexadecimal strings of length ten have exactly two A’s and at most two B’s?
- How many hexadecimal strings of length ten have six digits from the set 0, 1, 2, 3, 4, 5, 6, 7, 8, 9 and four digits from the set A, B, C, D, E, F? No repetition is allowed.
- How many hexadecimal strings of length ten have exactly four A’s and all remaining digits distinct from each other?