Are 十常八九 and 十之八九 interchangeable?
Are they the same meaning phrase that are interchangeable in this?: "天下不如意事,十常八九"

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Are 十常八九 and 十之八九 interchangeable?
Are they the same meaning phrase that are interchangeable in this?:  "天下不如意事,十常八九"

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十常八九-我有生以来从未用过这个短句.

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I don't think 十常八九 is a correct phrase.Chinese native speaker only use 十之八九.

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I think 十之八九 is used more frequently in general, while 十常八九 is more used in the phrase you mentioned.

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可以互换~

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nomally, "十常八九“ regarding things negatively；but "十之八九” is just about the ratio。