Question: Hello, could you help me out with this question please! Thank you! A box contains 4 nails and 3 screws. Mary randomly picks an object

Hello, could you help me out with this question please! Thank you!

"A box contains 4 nails and 3 screws. Mary randomly picks an object from the box. She continues picking objects until she chooses a nail. What is the probability that she will choose 3 screws from the box?"

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