How many of the Lira satellites were successful?

Kosmos 1375 was placed into a low Earth orbit with a perigee of 986 kilometres (613 mi), an apogee of 1,003 kilometres (623 mi), 65.8 degrees of inclination, and an orbital period of 105 minutes.[2] On 18 June 1982, it was successfully intercepted and destroyed by Kosmos 1379 in the final Soviet anti-satellite weapons test to be conducted. As of 2022, debris is still in orbit.[1][5]

Kosmos 1375 was the last of ten Lira satellites to be launched,[2] of which all but the first were successful. Lira was derived from the earlier DS-P1-M satellite, which it replaced.

10 were launched, 1 was not successful, so 10-1 = 9 were successful.