21
That would be -5.
22
It is 11 which is also a prime number
equivalent fractions for 11/13 = 22/26, 33/39, 44/52, 55/65,... To get the equivalent fractions of 11/13: Multiply 11/13 by 2/2, 3/3, 4/4, 5/5,... 11/13 * 2/2 = 22/26 11/13 * 3/3 = 33/39 11/13 * 4/4 = 44/52 11/13 * 5/5 = 55/65
21
That would be -5.
The missing number is 1321!!! Simple Fibonacci row! 0+1=1 1+1=2 1+2=3 2+3=5 3+5=8 5+8=13 8+13=21 13+21=34 ......
4 and 2 5ths = 22/5 2 and 3 5ths = 13/5 22/5 + 13/5 = 35/5 = 7/1 = 7
22
There are 2 missing. The sequence is 1,1,2,3,5,8,13,21. the equation is na=na-1+na-2. 1+1=2,+1=3,+2=5,+3=8,5=13,+8=21 The numbers you are missing are 1 and 8
It is 11 which is also a prime number
39
equivalent fractions for 11/13 = 22/26, 33/39, 44/52, 55/65,... To get the equivalent fractions of 11/13: Multiply 11/13 by 2/2, 3/3, 4/4, 5/5,... 11/13 * 2/2 = 22/26 11/13 * 3/3 = 33/39 11/13 * 4/4 = 44/52 11/13 * 5/5 = 55/65
It is almost the Fibonacci sequence, which is 0 1 1 2 3 5 8 13 21 34 55 ...1 + 2 = 32 + 3 = 53 + 5 = 85 + 8 = 13So, the sequence is 1 2 3 5 8 13
1, 1, 2, 3, 5, 8, 13, 21... is the Fibonacci SeriesIt could as well be a series of prime numbers :1, 2, 3, 5, 7, 11, 13, 17, 19, etc.
It can be: (22)+(13+5)/9 = 24