Conditional Probability [IB Math AA SL/HL]

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This video covers Conditional Probability. Part of the IB Mathematics Analysis & Approaches SL & HL courses in Topic 4, Statistics & Probability

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[mochifit]

I do not understand how the tree was made with the venn diagram data
. Wouldent A be 0.5, not a be 0.5.
B be 0.4 and not be be 0.6