The missing number is 21.
The reason is because you are adding seven and then subtracting one. You start out with 3 (3 + 7 = 10) then (10 - 1 = 9) then (9 + 7 = 16) and so on.
Chat with our AI personalities
c) 17
22
10 30 15 16 48 24 25 75...
75The number which best completes the sequence 10 30 15 16 48 24 25 is 75.
10, 12, 14, 15, 16, 18, 20