This math topic focuses on the calculation of probabilities using the nCm notation, also known as the combination formula. The problems provide various expressions in nCm notation and ask for the evaluation of these combinations. The skills practiced include understanding and applying the combination formula to solve problems that involve choosing a subset of elements from a larger set. Each question presents multiple-choice answers, reinforcing the ability to perform calculations related to permutations and combinations, essential concepts in probability and statistics.
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What is the value of this probability expression?