This is a nice probability question asked in an interview for a job at Amazon. Learn two ways to solve it!

Source

https://www.careercup.com/question?id=3227685

Paper by Dr. Gleb Yakubov

Dolan, Grace K., et al. “Probing adhesion between nanoscale cellulose fibres using AFM lateral force spectroscopy: The effect of hemicelluloses on hydrogen bonding.” Carbohydrate polymers 208 (2019): 97-107. (https://doi.org/10.1016/j.carbpol.2018.12.052). See the footnote on page 102.

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