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QUESTION

# Coordination number of cobalt in [Co(en)2Br2]cl2???

The coordination number of Co in [Co(en)_2Br_2]^(+) is 6.

Ethylenediamine is a bidentate ligand; it has 2 donor atoms to coordinate to the metal centre in a 5-membered chelate ring. Note that this (I presume) is a Co^(3+) complex, i.e. d^6 configuration, whose formula is [Co(en)_2Br_2]^(+), not as quoted in your question.