Table:
0
A
B
C
D
E
1
Task No.
Day announced
Options
Viewers' selection
Result
2
1
Day 43 (May 4, 2008)
Alex, Ejay, Josef, Nan, and Robi
Josef
Completed
3
2
Day 44 (May 5, 2008)
Robi, Valerie, Alex
Robi
Failed
4
3
Day 45 (May 6, 2008)
Ejay, Alex, Nan
Nan
Completed
5
4
Day 46 (May 7, 2008)
Valerie, Nicole, Alex
Nicole
Completed
6
5
Day 47 (May 8, 2008)
Beauty, Ejay, Alex
Beauty
Completed
7
6
Day 50 (May 11, 2008)
Alex, Ejay, Nan, Robi
Robi
Failed
8
7
Day 51 (May 12, 2008)
Priscilla, Valerie, Alex, Ejay
Ejay
Failed
9
8
Day 52 (May 13, 2008)
Rona, Priscilla, Valerie, Alex
Alex
Completed
10
9
Day 54 (May 15, 2008)
Priscilla, Rona, Valerie
Rona
Completed
11
10
Day 55 (May 16, 2008)
Valerie, Priscilla
Valerie
Failed

Questions and formulas:
Question: What were the options that were completed before the 4 th task that had viewers selecting nan?
Formula: LET(query1,LET(query1,FILTER(A1:E1,(E1="completed")*(D1="nan")),SUMMARIZE(CHOOSECOLS(query1,3),SUMX(CHOOSECOLS(query1,1)))),FILTER(query1,CHOOSECOLS(query1,2)<4))
Formula2: LET(query1,LET(query1,FILTER(A2:E11,(E2:E11="completed")*(D2:D11="nan")),SUMMARIZE(CHOOSECOLS(query1,3),SUMX(CHOOSECOLS(query1,1)))),FILTER(query1,CHOOSECOLS(query1,2)<4))
Level: hard
Question: when was it announced that the viewers selected robi out of alex, ejay, nan, robi?
Formula: UNIQUE(CHOOSECOLS(FILTER(A1:E1,(D1="robi")*(C1="alex, ejay, nan, robi")),2))
Formula2: UNIQUE(CHOOSECOLS(FILTER(A2:E11,(D2:D11="robi")*(C2:C11="alex, ejay, nan, robi")),2))
Level: medium
Question: What day was it when viewers selected ejay?
Formula: UNIQUE(CHOOSECOLS(FILTER(A1:E1,D1="ejay"),2))
Formula2: UNIQUE(CHOOSECOLS(FILTER(A2:E11,D2:D11="ejay"),2))
Level: medium