1. Write a recursive method that displays a given message n times. 2. Write a recursive method that finds the number of occurrences of a specified letter in a given string. 3. Define a recursive...

1. Write a recursive method that displays a given message n times.

2. Write a recursive method that finds the number of occurrences of a specified letter in a given string.

3. Define a recursive method f that, given a nonnegative integer n, returns

• n % 2 when n ranges from 0 to 9

• f(n / 10) + (n % 10) % 2 when n is greater than or equal to 10