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πŸ“° Solution: Since one marker is mandatory, choose 1 additional marker from the remaining 3: $\dbinom{3}{1}$. Then, select 2 sequences from 6: $\dbinom{6}{2}$. Multiply these: $\dbinom{6}{2} \times \dbinom{3}{1} = 15 \times 3 = 45$. The total number of valid combinations is $\boxed{45}$.Question: A tech startup founder has 8 potential investment opportunities and wants to diversify by selecting 5, but two specific opportunities are mutually exclusive. How many valid investment portfolios can be formed? πŸ“° Solution: First, calculate the total number of ways to choose 5 opportunities from 8 without restrictions: $\binom{8}{5} = 56$. Next, subtract the number of invalid portfolios that include both mutually exclusive opportunities. If both are selected, the remaining 3 are chosen from the other 6: $\binom{6}{3} = 20$. Thus, the valid portfolios are $56 - 20 = 36$. The final answer is $\boxed{36}$. πŸ“° Question: A science educator designs a 6-module interactive curriculum using 3 physics simulations, 2 chemistry experiments, and 1 biology lab. How many distinct arrangements are possible if the biology lab must not be placed after the chemistry experiments? πŸ“° What Food Has Mg 4827160 πŸ“° Low Cost Etfs That Every Budget Minded Investor Is Suddenly Obsessed With 1332892 πŸ“° Glise Fonde Au Xixe Sicle 1573219 πŸ“° Small Water Softener Systems 692145 πŸ“° Can Smartone Solve Your Daily Struggles Find Out Now 4000465 πŸ“° Rock Psychedelique 3598678 πŸ“° You Wont Believe How Addictive Clicking Online Games Are Right Now 1561510 πŸ“° Niftyfifty Today 3703123 πŸ“° Hhs Washington Dc Scandal The Complete Breakdown Of The Untold Crisis Inside 1828437 πŸ“° Youll Never Believe How Stylish This 30 Inch Vanity Actually Isshop Now 5327772 πŸ“° Aloft Tallahassee Downtown 4731754 πŸ“° Jonah Hill Weight Loss 2661596 πŸ“° The Ultimate Gamers Lounge Essential This Chair Is A Wild Hit Among Players 1499516 πŸ“° Best Horror Games Pc 4565017 πŸ“° Ultimate Bloxs Fruits Tier List Guaranteed To Boost Your Level To Legendary 9448336