(7 x 6 x 5 x 4) = 840 different ways.
But each (4 x 3 x 2) = 24 ways result in the same setof 4 .
So there are only 840/24 = 35 different sets of 4 figurines.
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Assuming the 20 are all different, there are 20C11 = 20!/(11!*9!) = 167,960 ways.
Nine
24 ways
93
7C4 = 35