10 (between 7 and 13)
The sequence is 1,2,3,5,8,13,21.......8 is the missing number. This is known as a Fibonacci Sequence. The first two numbers are supplied and then further numbers in the sequence are formed from the sum of the two prior numbers. 3 = 1 + 2 5 = 2 + 3 8 = 3 + 5.....and so on.
The spacing is 6 1+6=7 7+6=13 13+6=19 19+6=25 so the missing number in the sequence is 13
The missing number is 26. The number after 29 is 58.
The solution depends on how many numbers are missing and where they were. If there is only one, If it is between 4 and -5 then -0.5 If it is between -5 and -10 then -8 If it is between -10 and -16 then -13 Of course, the answer would be different if there were more than one number missing.
21 between 13 and 34; it is the Fibonacci numbers where each successive number is the sum of the previous two.
8 and 34 Alterative answer: Convensionally, the Fibonacci sequence starts with two 1s. So 1 and 8 are missing.
342
356
71
It is the Fibonacci sequence. Whereby each number is the sum of the preceding two numbers. The next digits are 13(5+8) 21 (13+8)etc.
34. Each number is the sum of the two preceding numbers. This is called the Fibonacci Sequence.
1 2 3 4 5 6 7 8 9 10 11 12 13. Could not be simpler!