# 2: Kotlin basics

### **Question 1**

Which of the following declares an unchangeable list of strings?

* [ ] `val school = arrayOf("shark", "salmon", "minnow")`
* [ ] `var school = arrayOf("shark", "salmon", "minnow")`
* [x] `val school = listOf("shark", "salmon", "minnow")`
* [ ] `val school = mutableListOf("shark", "salmon", "minnow")`

### **Question 2**

What will be the output of the following code?\
`for (i in 3..8 step 2) print(i)`

* [ ] 345678
* [ ] 468
* [ ] 38
* [x] 357

### **Question 3**

What is the purpose of the question mark in this code?\
`var rocks: Int? = 3`

* [x] The type of the variable `rocks` isn't fixed.
* [x] The variable `rocks` can be set to null.
* [ ] The variable `rocks` cannot be set to null.
* [ ] The variable `rocks` shouldn't be initialized right away.


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