Can I have a variable number of generic parameters?

In my project I have the following three interfaces, which are implemented by classes that manage merging of a variety of business objects that have different structures.

public interface IMerger<TSource, TDestination>
{
    TDestination Merge(TSource source, TDestination destination);
}

public interface ITwoWayMerger<TSource1, TSource2, TDestination>
{
    TDestination Merge(TSource1 source1, TSource2 source2, TDestination destination);
}

public interface IThreeWayMerger<TSource1, TSource2, TSource3, TDestination>
{
    TDestination Merge(TSource1 source1, TSource2 source2, TSource3 source3, TDestination destination);
}

This works well, but I would rather have one IMerger interface which specifies a variable number of TSource parameters, something like this (example below uses params; I know this is not valid C#):

public interface IMerger<params TSources, TDestination>
{
    TDestination Merge(params TSource sources, TDestination destination);
}

It there any way to achieve this, or something functionally equivalent?