Lists - General Questions

What is the output of the following code?

a = [1, 2, 3]
print(a.index(3), a.count(4))

What is the output of the following code?

a = [1, 2, 3]
a[1:2] = [7, 8, 9]
print(a)

What is the output of the following code?

a = [1, 2]
a.extend([3, 4])
print(a)

What is the output of the following code?

a = [1, 2, 3]
a.insert(1, 9)
print(a)

What is the output of the following code?

a = [1, 2, 3, 4, 5]
print(a[1:4], a[::2])