can combo() be solved using enumerate()?

You won't be able to use enumerate for this problem since enumerate is meant for retrieving the index and the item of a single iterable that you're iterating through. In this case, the example shows combo([1, 2, 3], 'abc') so you might be able to do it using enumerate but it won't cover every situation like combo('bob', 'abc').

However, there is a useful function in python which can combine multiple iterables into a iterable of tuples as such.

>>> iter1 = [1, 2, 3, 4]
>>> iter2 = [4, 5, 6, 7]
>>> list(zip(iter1, iter2))
[(1, 4), (2, 5), (3, 6), (4, 7)]

The zip function returns a generator-like object (not sure if you've learned them yet) which need to be converted into a list to view them. So you could complete the combo function as such:

def combo(iter1, iter2):
    return list(zip(iter1, iter2))

But it won't accept this solution, since it's a "shortcut", haha.