How many different matches are possible?ġ9) In a seventh-grade dance class, there are 20 girls and 17 boys. \(\quad\) d) the committee must have 5 boys and 3 girlsġ8) From a group of 12 male and 12 female tennis players, two men and two women will be chosen to compete in a men-vs-women doubles match. \(\quad\) c) no females are included on the committee \(\quad\) b) no males are included on the committee In how many ways can a committee of 8 students be selected if: \(\quad\) c) the group contains at least four girlsġ7) A class of 25 students is comprised of 15 girls and 10 boys. \(\quad\) b) the group contains four girls and three boys How many ways can a group of seven be selected to gather firewood: no face cards)?ġ3) How many different poker hands of 5 cards are possible if none of the cards is higher than \(8 ?\)ġ4) If a person has 10 different t-shirts, how many ways are there to choose 4 to take on a trip?ġ5) If a band has practiced 15 songs, how many ways are there for them to select 4 songs to play at a battle of the bands? How many different performances of four songs are possible?ġ6) Fifteen boys and 12 girls are on a camping trip. One way to remember the difference between a permutation and a combination is that on a combination pizza it doesn't make any difference whether the sausage goes on before the pepperoni or whether the onions are put on first-so in a combination, order is not important!įind the value of the following expressions.ĩ) How many three-topping pizzas can be made if there are twelve toppings to choose from?ġ0) How many bridge hands of 13 cards are possible from a deck of 52 cards?ġ1) How many poker hands of 5 cards are possible from a deck of 52 cards?ġ2) How many different bridge hands of 13 cards are possible if none of the cards is higher than 10 (i.e. r/CheatAtHomework - If you really can't be bothered with any of the rest of this "learn how to do it" crap and want someone to directly do it all for you.In a combination in which the order is not important and there are no assigned roles the number of possibilities is defined as: r/AccountingStudentHelp - For accounting (dead?). r/ChemistryHomework - A small chemistry-help sub. r/PhysicsHomework - A small physics-help sub. When correcting flaws, it's a good idea to use an example to illustrate why the flaw is wrong. It is good practice to guide the student to the solution instead. When answering, please do not give out the actual answer. Permutations and Combinations are super useful in so many applications from Computer Programming to Probability Theory to Genetics. Remember to give a reason when reporting!ĭo not answer any questions that break rules #1 or #2 above. Please kindly report any posts that violate the above rules. Solution This is a permutation because they are arranging the songs in order to make the program. Each post contributes to the archive of knowledge mentioned in rule 4. Similarly, meta posts should be tagged with. Posts offering free tutoring should be tagged with. No advertising for paid services of any sort. Likewise, searching up relevant terms in the subreddit search bar can also answer your question for you. Make sure you first look up definitions you don't know, instead of asking us. "High school problem" and "help plz" are not good titles. (Note: This rule is relaxed for extracurricular problems and questions of clarification.)ĭescriptive titles. In other words, show your numbers, if applicable. Just saying you made an attempt, or how you made an attempt, is not considered proof of working. Showing only your final answer is not considered proof of working. As I understand, permutations are to be used when order matters, as in, selecting a capitain and a vice captain of a team, and combination when selecting any 2 players where order does not. So I have been having trouble regarding the usage of Permutations and Combinations in problems. Posts that do not obey this rule will be removed until proof of working is shown. Help regarding Permutations and Combinations. Try SOMETHING before you post here, and post your attempts. RULES FOR SUBMISSIONS:ĭO NOT ASK US TO HELP YOU ON TESTS OR EXAMS. If you're willing to learn, we're willing to teach.įull rules and FAQ are here. r/MathHelp is, as the tin says, help with your mathematical questions.
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