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Home » One batch requires 0.4 mol A and 0.6 mol B. - SUpost

One batch requires 0.4 mol A and 0.6 mol B. - SUpost

📅 July 6, 2026 👤 scraface

Jul 06, 2026

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📌 eq 2 $, cancel $ t - 2 $: $ G(t) = t + 2 $. The domain excludes $ t = 2 $, so $ t \in (-\infty, 2) \cup (2, \infty) $. Simplified form: $ G(t) = t + 2 $, domain: $ oxed{(-\infty, 2) \cup (2, \infty)} $.Question: If a linguist randomly selects three distinct letters from the English alphabet, what is the probability that they form a placeholder typographic symbol, given that there are 10 such symbols and 26 letters?

📌 Solution: The total number of ways to choose 3 distinct letters is $inom{26}{3}$. The favorable cases involve selecting 3 letters that correspond to exactly one placeholder symbol. Assuming each symbol is defined by a unique combination of 3 letters (with no overlap in symbol definitions), there are 10 favorable combinations. Thus, the probability is $rac{10}{inom{26}{3}} = rac{10}{2600} = rac{1}{260}$. $oxed{\dfrac{1}{260}}$

📌 Question: If a historian randomly arranges 5 historical documents, 2 of which are letters and 3 are manuscripts, what is the probability that the two letters are adjacent?

📌 Solution: Treat the two letters as a single entity. This gives $4!$ arrangements for the entities (the letter pair and 3 manuscripts). The letters within the pair can be ordered in $2!$ ways. Total favorable arrangements: $4! imes 2!$. Total possible arrangements: $5!$. The probability is $rac{4! imes 2!}{5!} = rac{2}{5}$. $oxed{\dfrac{2}{5}}$

📌 Question: If a researcher studies 4 random integers between 0 and 10 inclusive, what is the probability that all are even?

📌 Solution: There are 11 integers (0â10), of which 6 are even (0, 2, 4, 6, 8, 10). The number of ways to choose 4 distinct even integers is $inom{6}{4}$. The total number of ways to choose 4 distinct integers is $inom{11}{4}$. The probability is $rac{inom{6}{4}}{inom{11}{4}} = rac{15}{330} = rac{1}{22}$. $oxed{\dfrac{1}{22}}$

📌 Question: If a linguist generates a 3-letter word using distinct letters from the English alphabet, what is the probability that it contains at least one vowel (A, E, I, O, U)?

📌 Solution: Total letters: 26. Vowels: 5, consonants: 21. Total 3-letter arrangements with distinct letters: $26 imes 25 imes 24$. Unfavorable cases (no vowels): $21 imes 20 imes 19$. Favorable probability: $1 - rac{21 imes 20 imes 19}{26 imes 25 imes 24} = 1 - rac{7980}{15600} = 1 - rac{133}{260} = rac{127}{260}$. $oxed{\dfrac{127}{260}}$

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