Bendigo, you and the person who liked your comment, please read what I wrote again. This time slower. Then let me know if you still think it is wrong. Specifically the part where I said "Hence, the chance of finding something is 79%."
Also, let me put it this way to re-jog your memory for how year 7 maths works. If I asked you to drill for oil and get salt water twice in a row, what is the probability of that happening? It's 4.41%, because the question is asking for the condition to be "salt water twice in a row".
Here is a tree, I have amended it to help you more (instead of heads and tails, use Bendigo finds oil and no oil: .... lol.
6 months from now, page-14
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