|
A multiple choice question has 5 answers in which 2 ofthem only are correct. What is the number of casesin which you can answer this question? Rule Answer Incorrect Incorrect Correct Correct Incorrect Consider the set of the four football teams F= {RMA, FCB, JUV, BYR} Each two teams in this set must play one game with each other. How many possible games are there? Rule Answer If each one of this class (25 students) should shake hands once with everybody else. How many hand-shakes will be? Rule Answer We want to choose a team of three students to represent our school in a certain competition among schools from the students of third secondary (LS (25) & GS (19)). How many teams can be formed? Rule Answer An ice-cream shop has 14 flavors of ice-cream. You want a cone of ice-cream containing three flavors. In how many ways can you choose your cone?Rule Answer A restaurant provides the following choices: Dessert: ice-cream or cheese-cake A meal consists of choosing one item from Appetizer, one from Entrée and one from Dessert. How many different meals can be ordered? Rule Answer How many two-symbol code words can be formed if the first symbol is an uppercase English letter and the second symbol is a digit? (Example: N1, C4, …) Rule Answer A symbol can be an English letter (Upper or lower case), a digit from 0 to 9 or one of : %, $, @, -, _, # You Know that the password for your account is formed of 6 symbols.How many possible passwords are there? ( Note: the letters are case: sensitive: means that A≠a ) Rule We want to choose a team of three students from the school to participate in a national contest. How many teams are there? Rule
Answer Rule We want to choose a team of three students from the school to participate in a national contest. How many teams are there if: The three students should be one from each secondary year?
Answer Note:If you want something AND something use (×) Rule We want to choose a team of three students from the school to participate in a national contest. How many teams are there if: the three students should be in the same secondary year?
Answer Note:If you want something OR something use (+) Rule We want to choose a team of three students from the school to participate in a national contest. How many teams are there if: the three students should be all boys? all girls?
Answer Rule We want to choose a team of three students from the school to participate in a national contest. How many teams are there if: the three students should be a boy from each secondary year?
Answer Rule We want to choose a team of three students from the school to participate in a national contest. How many teams are there if: the three students should be boys in the second secondary?
Answer Rule We want to choose a team of three students from the school to participate in a national contest. How many teams are there if: the team should contain exactly one boy?
Answer Or Rule We want to choose a team of three students from the school to participate in a national contest. How many teams are there if: there should be at least one boy in this team?
Answer Or Rule We want to choose a team of three students from the school to participate in a national contest. How many teams are there if: the team should contain at most two girls?
Answer |