1 - Fill the space blanks If we make a sequence selecting three elements from three different elements

{1, 2, 3} and we permit overlapped elements for the sequence, then the total

number of sequences is [ ] . If we do not take into account the order, the total

number of the selections is [ ] .

I'm totally lost in this, what is overlapped elements? This is about what math content? And what is the answer? Please i need help.