Sorry you are wrong, there has only ever been 4, as Stuart Sutcliffe was gone before they became The Beatles and yes, Pete Best was replaced by Richard Starkey, aka Ringo. Before that, they were the Silver Beetles.60% again.
Q 6. is wrong... {originally there were 5. not 4}
Lennon, McCartney, Harrison, Sutcliffe on bass guitar, and Best on drums.
Sutcliffe left the band and Peter Best was replaced by Ringo..