+0
1a I will treat this with the utmost importance.

1b I will treat this with utmost importance.

2a I can say, with the utmost certainty, that my understanding of grammar is woeful.

2b I can say, with utmost certainty, that my understanding of grammar is woeful.

3a You are of a great help.

3b You are of great help.

Which are correct and why please?

Thanks a lot.
+0
Only 3a is wrong. The form takes the uncountable only: to be of great help/importance/etc.
Comments  
Thanks.

Why can the first two sentence versions work with or without the article?