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Here's my Python solution:

from itertools import combinations
import numpy as np


def sum_target(num_list: list, combs: int, target: int) -> int:
        for t in combinations(num_list, combs):
            if sum(t) == target:
                return np.prod(t)


if __name__ == '__main__':

        with open('day_01_input.txt', 'r') as f:
            input_num_list = [int(x) for x in f.readlines()]

        # Part 1
        print(f'{sum_target(input_num_list, 2, 2020)=}')

        # Part 2
        print(f'{sum_target(input_num_list, 3, 2020)=}')

Probably not as efficient as others but seems readable.