The thirty-member Science Club is choosing a seven-member committee to determine which competitions to attend next year. How many different possible committees can be chosen?a.872,640b.593,775c.2,035,800d.658,008e.1,560,780
Q. The thirty-member Science Club is choosing a seven-member committee to determine which competitions to attend next year. How many different possible committees can be chosen?a.872,640b.593,775c.2,035,800d.658,008e.1,560,780
Identify Problem Type: Identify the type of problem.We need to find the number of ways to choose a seven-member committee from a thirty-member club. This is a combination problem because the order in which we select the committee members does not matter.
Use Combination Formula: Use the combination formula.The number of ways to choose k members from a group of n members is given by the combination formula nCk=k!⋅(n−k)!n!, where ! denotes factorial.
Apply Formula to Problem: Apply the combination formula to the given problem.Here, n=30 (total members) and k=7 (members to choose).Calculate 30C7=(7!∗(30−7)!)30!.
Simplify Factorials: Simplify the factorials.Calculate 7!×23!30! by canceling out the common terms in the numerator and the denominator.7!×23!30!=7×6×5×4×3×2×130×29×28×27×26×25×24.
Perform Calculations: Perform the calculations.Divide each term in the numerator by a corresponding term in the denominator to simplify the calculation:630=529 is a prime number and cannot be simplified.728=4327=926 is a prime number and cannot be simplified.525=5424=6Now multiply the simplified numbers together:5×29×4×9×26×5×6=593,775.
Check Answer Choices: Check the answer choices.The calculated number 593,775 matches one of the given answer choices, which is option b.
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