Table:
0
A
B
C
D
E
1
State (class)
Vacator
Reason for change
Successor
Date of successors formal installation
2
New Hampshire (2)
Styles Bridges (R)
Died November 26, 1961
Maurice J. Murphy, Jr. (R)
January 10, 1962
3
Kansas (2)
Andrew F. Schoeppel (R)
Died January 21, 1962
James B. Pearson (R)
January 31, 1962
4
South Dakota (3)
Francis H. Case (R)
Died June 23, 1962
Joseph H. Bottum (R)
July 9, 1962
5
Idaho (2)
Henry Dworshak (R)
Died July 23, 1962
Leonard B. Jordan (R)
August 6, 1962
6
Massachusetts (1)
Benjamin A. Smith II (D)
Successor elected November 6, 1962
Ted Kennedy (D)
November 7, 1962
7
New Mexico (1)
Dennis Chavez (D)
Died November 18, 1962
Edwin L. Mechem (R)
November 30, 1962

Questions and formulas:
Question: How many total reason for change are listed corresponding to the successor Leonard B. Jordan (r)?
Formula: UNIQUE(CHOOSECOLS(FILTER(A1:E1,D1="Leonard B. Jordan (R)"),3))
Formula2: UNIQUE(CHOOSECOLS(FILTER(A2:E7,D2:D7="Leonard B. Jordan (R)"),3))
Level: medium
Question: What state had November 30, 1962 as the date of the successors formal installation?
Formula: UNIQUE(CHOOSECOLS(FILTER(A1:E1,E1="November 30, 1962"),1))
Formula2: UNIQUE(CHOOSECOLS(FILTER(A2:E7,E2:E7="November 30, 1962"),1))
Level: medium
Question: How many vacant seats were filled by newcomer Joseph H. Bottum (r)?
Formula: ROWS(UNIQUE(FILTER(B1, D1="Joseph H. Bottum (R)")))
Formula2: ROWS(UNIQUE(FILTER(B2:B7, D2:D7="Joseph H. Bottum (R)")))
Level: medium