How many geometric isomers are possible for the complex [crf3br3]3–?

that regarding the after buildings has optical (chiral)
[Co(en)3]3–?
isomers? [Co(en)Br4]+ [Co(en)(NH3)4]3+ Co(NH3)3Br3 [CrF3Br3]–

Which of the following complexes has optical (chiral)
isomers?
[Co(NH3)4Br2]+
[Co(en)3]3+
Co(NH3)3Br3
[Co(en)Br4]– 
[Co(en)(NH3)4]3+
How many geometric isomers are possible for the complex
[CrF3Br3]3–?3+ exactly how many geometric isomers are feasible for the complex

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