**3**.

**14**1

**5926**535

**8**9

**7**932384626433832795

**0**

However, e only takes 21 digits.

**2**.

**718**281828

**4590**452

**3**53

**6**

Suppose you pick random digits from 0 to 9 with probability 1/10 of each digit. What is the average number of digits required to get all 10 digits?