What is the missing circle sequence number 40,20,?,40,20,10

40,20,?,40,20,10?? = 10Because, the sequence is 40,20,10 and then replay it againor40 - 20 = 2020 - 10 = 1040 - 20 = 2020 - 10 = 10So, ? = 10

It is 10 that ìs missing because the sequence shows that after 20 is 10