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Understanding the Context

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Key Insights

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πŸ“° Thus, we must count the number of 3-element subsets of the 9 strata such that each subset contains exactly one F, one R, and one D. πŸ“° But the problem does not specify how many of the 9 strata contain each type. However, the condition all three fossil types appear in at least one selected stratum implies we are selecting 3 strata and want the probability or count of those subsets where the multiset of types includes all three. Since only one fossil appears per stratum, this means: the three selected strata must include one F, one R, and one D. πŸ“° Alternatively, a cleaner and standard combinatorics interpretation consistent with olympiad style: πŸ“° Josh And Johns 8682654 πŸ“° This Hidden Skill You Never Knew You Hadyour Passion For French Is Unstoppable 6259654 πŸ“° Secret Ingredient In Yolk That Rewires Your Taste Buds 3178231 πŸ“° The Forgotten Path Behind The Tail Of The Dragondragon Weather Waiting 2621986 πŸ“° Chart Usdcad 3590645 πŸ“° Typical Interest Rate Of A Traditional Savings Account 5288730 πŸ“° Deck Staining 6846657 πŸ“° Novi Library 5587906 πŸ“° Kmode Exception Not Handled Windows 11 2934089 πŸ“° New Item Alert This Unbelievable Product Is Changing Everythingdont Miss Out 6585356 πŸ“° Add A Printer 1054190 πŸ“° Raz Kids The Dangerously Funny Team Stealing Streamsheres Why 4053525 πŸ“° Navy Pier Hotel 7227555 πŸ“° Thomas Edison Inventions 9516182 πŸ“° Vivien Thomas 5962301