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They have bought a vast number of products, ranging from pirated CDs and DVDs to fake designer clothing and accessories.

I was told that there are two mistakes in this sentence. I guess it should be "a vast variety" instead of "a vast number". I cannot find the other one. Please help.

Thank you.
Comments  
Hi,

I don't object to 'a vast number'.

Who told you there were two mistakes?

eg A teacher? eg A native speaker?

Clive
It is from an exercise.

Do you mean the sentence is ok? No grammatical mistake there?

Thank you.
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Hi,

Seems OK to me.

Clive
The problem I have with your sentence is that I can not figure out if you mean a lot of things in total number or a lot of different kinds of things as in a great variety.
HongkieI guess it should be "a vast variety" instead of "a vast number". I cannot find the other one. Please help.
Hi Hongkie,

If I were to change the word "number" to the word "variety", then I would also change the word "vast" to "wide".

"Wide variety" and "vast number" are both very commonly used collocations. The word "vast" does not collocate nearly as well with "variety" as the word "wide" does.
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Thank you, Yankee.