Although (the) majority of (the) patients had surgery,

I have a paragraph about the proportion of patients treated surgically. One of the paragraph’s sentences is as follows:

Although the majority of patients had surgery, 6% received non-operative management.

Although majority of the patients had surgery, 6% received non-operative management.

Although the majority of the patients had surgery, 6% received non-operative managament.

Which definite article use is correct in this case?