What was the very last episode of the Partridge Family before it went off the air?

Also, what was the name of the first ep?

First: "What? and Get Out of Show Business?" - Recently widowed mother, Shirley Partridge whose struggling to raise her five children whose playing in a band and, Shirley works a bank teller. Older brother and sister Keith (Lead vocals and guitar) and Laurie (Keyboards). Younger brothers and sister Danny (Bass guitar), Chris (Drums) and, Tracy (Tamborine and percussion) are playing in a band called "The Partridge Family". Ruben Kincaid, a kid hater was signed as their manager. Finally, the kids asked their mother to join the band. Reluctantly, she agreed but, for a single condition: if she faints the kids have to assist her.

Last: "...---... (S.O.S.)" - Shirley is surprised to learn that an old boyfriend is in town to make a speech. It turns out he is now a navy Captain and Keith and Danny are suspicious of his motives for their mother.