Please read the following table in Markdown format and then answer the question according to the table. Table cells in one row are seperated by '|', and different rows are seperated by '
'.

Table:
| No. in series | No. in season | Title | Directed by | Written by | Original air date | Production code |
| --- | --- | --- | --- | --- | --- | --- |
| 23.0 | 1.0 | "Rachel's Place" | Richard Correll | David W. Duclon & Gary Menteer | September 21, 1990 | 446451.0 |
| 24.0 | 2.0 | "Torn Between Two Lovers" | Gary Menteer | Janet Lynne Jackson | September 21, 1990 | 446454.0 |
| 25.0 | 3.0 | "Marriage 101" | Richard Correll | Pamela Eells & Sally Lapiduss | September 28, 1990 | 446452.0 |
| 26.0 | 4.0 | "Flashpants" | Gerren Keith | Stephen Langford | October 5, 1990 | 446455.0 |
| 27.0 | 5.0 | "The Crash Course" | Gary Menteer | Manny Basanese | October 12, 1990 | 446456.0 |
| 28.0 | 6.0 | "Boxcar Blues" | Mark Linn-Baker | Fred Fox, Jr. | October 19, 1990 | 446453.0 |
| 29.0 | 7.0 | "Dog Day Halloween" | Gerren Keith | David W. Duclon & Fred Fox, Jr. | October 26, 1990 | 446460.0 |
| 30.0 | 8.0 | "Cousin Urkel" | Gary Menteer | Pamela Eells & Sally Lapiduss | November 2, 1990 | 446457.0 |
| 31.0 | 9.0 | "Dedicated to the One I Love" | Gary Menteer | Sara V. Finney & Vida Spears | November 9, 1990 | 446458.0 |
| 32.0 | 10.0 | "The Science Project" | Gary Menteer | Pamela Eells & Sally Lapiduss | November 16, 1990 | 446461.0 |
| 33.0 | 11.0 | "Requiem for an Urkel" | Joel Zwick | David W. Duclon | November 23, 1990 | 446462.0 |
| 34.0 | 12.0 | "Fast Eddie Winslow" | Gerren Keith | Fred Fox, Jr. | November 30, 1990 | 446459.0 |
| 35.0 | 13.0 | "Have Yourself a Merry Winslow Christmas" | Richard Correll | David W. Duclon | December 21, 1990 | 446465.0 |
| 36.0 | 14.0 | "Ice Station Winslow" | Richard Correll | Gary Menteer | January 4, 1991 | 446464.0 |
| 37.0 | 15.0 | "Son" | Gary Menteer | José Rivera | January 11, 1991 | 446463.0 |
| 38.0 | 16.0 | "Do the Right Thing" | Gary Menteer | Pamela Eells & Sally Lapiduss | January 18, 1991 | 446466.0 |
| 39.0 | 17.0 | "High Hopes" | Gary Menteer | Fred Fox, Jr. & Denise Snee | February 1, 1991 | 446467.0 |
| 40.0 | 18.0 | "Life of the Party" | Gary Menteer | Janet Lynne Jackson | February 8, 1991 | 446468.0 |
| 41.0 | 19.0 | "Busted" | Richard Correll | David W. Duclon & Fred Fox, Jr. | February 15, 1991 | 446470.0 |
| 42.0 | 20.0 | "Fight the Good Fight" | Gary Menteer | Sara V. Finney & Vida Spears | March 1, 1991 | 446469.0 |
| 43.0 | 21.0 | "Taking Credit" | Richard Correll | David W. Duclon | March 15, 1991 | 446472.0 |
| 44.0 | 22.0 | "Finding the Words" | Richard Correll | Fred Fox, Jr. | March 22, 1991 | 446471.0 |
| 45.0 | 23.0 | "Skip to My Lieu" | Richard Correll | Charlene Seeger | April 1, 1991 | 446474.0 |
| 46.0 | 24.0 | "The Good the Bad and the Urkel" | Richard Correll | Pamela Eells & Sally Lapiduss | April 19, 1991 | 446475.0 |
Question:
What series number had an original airdate of March 1, 1991?
Answer:
42.0