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(Solved): A Coin Is Flipped Until 6 Heads Are Seen. What Is The Probability That It Is Flipped No More Than 7 ...

A coin is flipped until 6 heads are seen. What is the probability that it is flipped no more than 7 times?

Note: My teacher used negative binomial twice and got 0.0625. I do not know how she got that. An explanation would be very helpful. Thank you

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