10
21
This is the Fibonacci Series, where each term is the sum of the previous two. It continues 21, 34, 55 etc
The series appears to increase as follows: 1 (+3), 4 (+5), 9 (+7), 16,, etc. If so, the next number in the series would be 25 (16 + 9). * * * * * While mathematically equivalent, a simpler description is: 12, 22, 32, 42, 52 ...
4
The next number is -21
10
225
the answer will be 21
This is the series of square numbers, (16= 4*4). The next number is 5*5=25.
21
21
21.
21
The next number is 25 but there are the sequence is infinite so there can be no end to the sequence.
12,14,16,18,20,22,24,26,28,30,32,34,36,38,40,42,44,46,48,50
it should already have come out