50.
Fit the quadratic Un = 6.5n2 - 16.5n + 12
21
21
22
21. Add the last 2 numbers to get the next.
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.).
To get the next number in the sequence, you simply multiply by 26*2=1212*2=2424*2=4848*2=96
These are Fibannoci's numbers. Therefore, the 7th number is 21.
It is 21 + 34 = 55
3,5,8,13 is followed by 21. 1,1,2,3,5,8,13,21,34,55,... is the Fibonacci series or Fibonacci sequence where the next number in the sequence is the sum of the last two numbers (1+1=2, 1+2=3, 2+3=5, etc.)
34. Each number is the sum of the two preceding numbers. This is called the Fibonacci Sequence.
21. This is the Fibonacci series.
It all depends on the sequence you are talking about. For example, the next number in the sequence 0,1,1,2,3,5,8,13,_ would be 21. This would be the Fibonacci sequence as the rule is add the 2 previous terms to get the next term. Another example would be this: 11,121,1331,14641,______.The missing number is 161051, following the pattern of powers of 11, 11^1, 11^2, 11^3 and so on. If you understand what I am trying to say, it all depends on the sequence you are trying to find the number in.