39. The rule here is starting with the number 9, add (-6 + sequence number * 6).
9 + (-6) = 3
3 + 0 = 3
3 + 6 = 9
9 + 12 = 21
21 + 18 = 39
39 + 24 = 63
The next number in the sequence 3-15-6-30-21 is -207.
28
21
If the last number is 1/3 (it should be), the next number is 5 and 1/3
The sequence is generated using cubes, or n^3. The next number in the sequence will be 4^3, or 256.
The next number in the sequence 3-15-6-30-21 is -207.
7203
8 and then 1.6
28
21
If the last number is 1/3 (it should be), the next number is 5 and 1/3
45. 0x2=0+3=3 3x2=6+3=9 9x2=18+3=21 21x2=42+3=45
22
35
This is a Fibonacci sequence. Each number in the sequence is the sum of the previous two numbers:3+5=85+8=138+13=2113+21=34
The sequence is taking half of the number and adding it to that number, 3/2 = 1.5, 3 + 1.5 = 4.5, the next number in the sequence is 15.1875
The answer is 21.Your numerical series is the beginning of a mathematical sequence called Fibonacci Numbers.The first number of the sequence is 0, the second number is 1, and each subsequent number is equal to the sum of the previous two numbers of the sequence itself (i.e. 0, 1, 1, 2, 3, 5, 8, 13, 21, etc.).