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📰 A micropaleontologist analyzes sediment layers containing microfossils from 3 types: foraminifera (F), radiolarians (R), and diatoms (D). She examines a core sample divided into 9 distinct strata. If she selects exactly 3 strata to analyze using stable isotope ratios, such that all three fossil types appear in at least one selected stratum, how many such combinations of 3 strata exist, assuming each stratum contains exactly one fossil type and all types appear across the 9 strata? 📰 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. 📰 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. 📰 Excel App For Macbook 📰 New Shows On Prime 📰 Microsoft Visual C Redistributable Do I Need Them All 📰 House Mortgage Rates 📰 A5 3 Times 106 4 322 1203298 📰 Smart Switch Samsung For Mac 7064088 📰 Cyberpunk 2077 Map 812039 📰 Kacey Musgraves Tour 9239889 📰 Connections July 22 1644787 📰 Redcoat Tavern 4243237 📰 Bacteria Mutans 367231 📰 Bank Of America Grants Pass 📰 Loves Park Water 4170775 📰 Verizon Fios Modems 📰 Best Generator For Home Power Outage 542153