It is 21 + 34 = 55
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.).
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The next number is 4, followed by -2
The next number in the pattern is 48. This pattern adds multiples of three to the existing number. 3 + (3 x 0) = 3 3 + (3 x 1) = 6 6 + (3 x 2) = 12 12 + (3 x 3) = 21 21 + (3 x 4) = 33 33 + (3 x 5) = 48 etc.
28
It is 21 + 34 = 55
The next number in the sequence 3-15-6-30-21 is -207.
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 is 21 because it is adding the last number stated.
63
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.).
The next number is -21
21: (3)+3=(6)+4=(10)+5=(15)+6=(21)
If you mean: 1 1 2 3 5 8 13 21 then the next number is 13+21 = 34
Looks Fibonacci, but you are missing the first 0... 0, 1, 1, 2, 3, 5, 8, 13, 21, 34, etc. where each number is the sum of the preceeding two.
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