Which of the following complexes will have 4 isomers
a) [Co(en)(NH3)2Cl2]Cl
b) [Co(PPh3)2(NH3)2Cl2]Cl
c) [Co(en)3]Cl3
d) [Co(en)2Cl​2]Br
is there any method to calculate them without checking all the structures ... some sort of shortcut ?

Dear Student,

No, there is no shortcut to check the number of isomers. 
(a) will have four different types of isomers


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