Labor's Madonna Jarrett is holding on to her primary-vote lead in the seat of Brisbane. -AAP Image
Three tight races will determine the size of Labor's majority in parliament as vote counting continues following the federal election.
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On Friday morning, the Australian Electoral Commission had Labor with 75 seats to the coalition's 59, the Greens with three seats, 12 on the cross bench.
The seats of Macnamara and Brisbane are without a two-candidate preferred count.
In Brisbane, Labor's Madonna Jarrett is holding on to her primary vote lead over the Greens, placing her in a strong position to take the seat from Liberal MP Trevor Evans.
She is 672 votes ahead of Greens candidate Stephen Bates.
In the Victorian seat of Macnamara, Labor MP Josh Burns is in the primary vote lead on 32.2 per cent.
But his fate will be determined by the race between Liberal candidate Colleen Harkin (29.5 per cent) and the Greens' Steph Hodgins-May (29.4 per cent).
Ms Harkin is currently 102 primary votes ahead of Ms Hodgins-May.
Liberal candidate Andrew Constance is 286 votes ahead of sitting Labor MP Fiona Phillips in the NSW electorate of Gilmore, with postal votes slightly favouring Mr Constance.
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