As many as you want. An unlimited number of ways.
How many languages can you write......? The answer: a lot (depending on the above question)
There are three ways you can write the number 10. You can use X, as in Roman numerals, ten, or 10.
Only one, in terms of numbers: 20,000
If you use each number once, there are six combinations.
As many as you want.
I can write my name in 100 different ways
There are many different ways one might write the numbers '608.' If one desires to write the numbers '608' in Roman numerals, one would write 'DCVIII.'
Jerry Spinelli writes many different books with many different categories.
Many different people have many different types of ideologies.