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Find the sum of number of geometrical isomers for following complexes.
`(a) [CoCl_(2)Br_(2)]^(2-) ” ” (b) [Rh(en)_(3)]^(3+) ” ” ( c) [Cr(en)_(2)Br_(2)]^(+)`
`(d)[Pt en Cl_(2)] ” ” ( e) [Co(NH_(3))_(3)(NO_(2))_(3)]`