Lambda and Functional Tools - General Questions

What is the output of the following code?

from functools import reduce
print(reduce(lambda a, b: a * b, [1, 2, 3, 4]))

What does map return in Python 3?

What is the output of the following code?

print(list(map(lambda x: x + 1, [1, 2, 3])))

What is the output of the following code?

pairs = [(1, 'b'), (2, 'a')]
print(sorted(pairs, key=lambda p: p[1]))

What is the output of the following code?

from functools import lru_cache
@lru_cache
def fib(n):
    return n if n < 2 else fib(n - 1) + fib(n - 2)
print(fib(30))