I also bought $7$ different postcards. How many ways can I send the postcards to my $3$ friends, so that each friend gets at least one postcard? How do i count the restriction that each friend must get

I also bought $7$ different postcards. How many ways can I send the postcards to my $3$ friends, so that each friend gets at least one postcard?

How do i count the restriction that each friend must get at least 1 or more postcards and the postcards are distinguishable?

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I also bought $7$ different postcards. How many ways can I send the postcards to my $3$ friends, so that each friend gets at least one postcard? How do i count the restriction t…

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