Problem in solving this probability question

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lollipop

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A fair coin is tossed repeatedly. What is the probability of obtaining a total of two tails before obtaining a total of three heads? The answer is 11/18
 
lollipop said:
A fair coin is tossed repeatedly. What is the probability of obtaining a total of two tails before obtaining a total of three heads? The answer is 11/18
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What are your thoughts? What have you tried? Where are you stuck?

Please be complete. Thank you! ;)
 
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