What kind of application would benefit from being written in F# opposed to the more conventional languages? [closed]

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Possible Duplicates:

What is F# being used for?

What are the benefits of using C# vs F# or F# vs c#

I have recently studied C#, WPF, a little bit of WCF and now I have read that Visual Studio 2010 will also support F#.

My question is: what kind of application is likely to need F# instead of C# or Visual Basic?

Is F# necessary to build Windows applications, which can already be written using C# and WPF?

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"what kind of application need F# instead of C# or Visual Basic?" - None. It's just another way of expressing the concepts, although quite more different from both C# and VB and they differ among themselves.