The question, “How many ways can 4 different students be selected in order from a class of 30 students?”, is a(n) . permutation mutually exclusive event combination independent event

permutation

Step-by-step explanation:

The permutation refers to the arrangement of a people, person, number, colors, alphabets or any other thing

While on the other hand the combination refers to the selection or choosing  a particular thing like - clothing, menu, subjects, etc

But in the given question it asks for the number of ways can different students be selected so its a case of permutation and the same is to be considered

fabric (square meters)                   cloaks

7                                                           21

4/3                                                         4

step-by-step explanation:

we are told that harry needs 2 square meters of fabric for every 6 wizard cloaks he makes.

1. first of all we will find how many cloaks can be made from 1 square meter of fabric by dividing 6 by 2.

we can see that 3 cloaks can be made from 1 square meter of fabric. now we will multiply 3 by 7 to find number of cloaks made from 7 square meters of fabric.

therefore, harry will make 21 cloaks from 7 square meters of fabric.

2. let us find how many square meters of fabric will be needed to make 4 cloaks.

first of all we will find fabric needed for 1 cloak by dividing 2 by 6.

we can see that fabric needed for 1 cloak is   square meter. now we will multiply   by 4 to find fabric needed for 4 cloaks.