superlatives

[aysaa]

Hello,

The reporter also asked Thomas Edison what was the hardest invention to develop. He answered quickly again -- the electric light. He said that it was the most difficult and the most important.

Must I add 'the most important invention' or 'one' at the and of the sentence or is it ok to just say 'the most important''?

Thanks.

[Barb_D]

It's okay without it. If you want to add something, use "one" and don't repeat "invention."