2020 US Senate Election- How many ways Democrats will end up with 50-51seats?

Scenario 1- Trump/Pence loses re-election. Jones(D-AL) wins re-election.
1)CO(Gardner-R) loses re-election.
2)AZ special(McSally-R) loses re-election.
3)NC(Tillis-R) loses re-election.

Scenario 2- Trump/Pence loses re-election. Jones (D-AL) loses re-election.
1)CO(Gardner-R) loses re-election.
2)AZ special(McSally-R) loses re-election.
3)NC(Tillis-R) loses re-election.
4)ME(Collins-R) loses re-election.

Scenario 3- Trump/Pence wins re-election. Jones(D-AL) loses re-election.
1)CO(Gardner-R) loses re-election.
2)AZ special(McSally-R) loses re-election.
3)NC(Tillis-R) loses re-election.
4)ME(Collins-R) loses re-election.
5)GA(Perdue-R) loses re-election.