Each of the five colleagues E1, E2, E3, E4, and E7 has to present their ideas regarding a specific project on a different day of a week starting from Monday and ending on Friday of the same week.
E3 has to present on Thursday. Only one person presents between E3 and E2. E7 do present either on Wednesday or on Friday. E4 has to present on the immediate day after E3.
How many people have presented before E1?
1
Three
2
One
3
None
4
Two