33
21. Add the last 2 numbers to get the next.
The pattern in the sequence 3, 6, 12, 21 can be identified by examining the differences between consecutive terms: 6-3=3, 12-6=6, and 21-12=9. The differences (3, 6, 9) are increasing by 3 each time. Continuing this pattern, the next difference would be 12 (9 + 3). Therefore, the next number in the sequence is 21 + 12, which equals 33.
75
My guess: 2.5
8
21. Add the last 2 numbers to get the next.
21. This is the Fibonacci series.
It is: 34
75
8 and then 1.6
The next composite number after 20 is 21.
The next two numbers in the sequence are... 45 & 54.
8
My guess: 2.5
21
If the last number is 1/3 (it should be), the next number is 5 and 1/3
34. Each number is the sum of the two preceding numbers. This is called the Fibonacci Sequence.