Definition: In this task you will be given a list of lists, of numbers. For every inner list, you should multiply every number in that list and put the results in your answer. The output should be a list of numbers with the same length as the number of the lists in the input list.
Input: [[1, 21], [-24, -4, 21, -1], [42, 38, -19, 46]]

[21, -2016, -1394904]