Dictionary / Vocabulary / 五分五分
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as likely as not; fifty-fifty; even match; tie
Also written 5分5分
彼が回復する見込みは五分五分だ。
It's even chances that he will get well.
勝負の見込みは五分五分。
The chances are even.
勝ち負けの確率は五分五分だ。
The chances of victory or defeat are even.