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how does error carry forward work in ib math studies?

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Hi, is there an error carry forward work in ib math studies? and if so how does it work? if i get a question regarding venn diagrams and probability for example, and i get the values wrong on the venn diagram and continue with the probability questions according to the venn diagram I've done, would i lose marks in the whole section? or would i get marks?

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Unless I'm mistaken, it works like this:

(a)Mistake: Lose your marks.

(b) provided this is correct (using the error in a), you should get full, or at least partial credit

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