- Combinatory Analysis: How do we determine "p" of C (9, p) = 84, following the result p = 3?

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How many liters are needed to react with 155 g of hydrogen? The variance of 88? The length of the minor arc AB of a circle, centre 'O', is 2π cm and the length of major arc is 22π cm.? I have one question for Geometry https://gyazo.com/01dab356883b78959df69f5c2179120e? The teacher gave the exact same grade to all my friends and -.?