12=2^2*3..So i will have to list the Sylow-2 subgroup of A4 whose cardinality will be 2^2=4 and Sylow-3 subgroup whose cardinality will be 3.

one of the book that i refered said that there are 4 Sylow-3 subgroups of cardinality 3 and 1 Sylow-2 subgroup of cardinailty 4..

Can anyone please explain me this!