20
2 is the answer
If 1,2,3,4,5, is a sequence, then the sum is 1+2+3+4+5 = 15
Actually the next number in the sequence is 17 A 19 , 23 , 29 , 31 ,.......... Prim number
The difference doubles each time. 2+3=5.. 5+6=11.. 11+12=23..Therefore the next number in the sequence would be 47, since 23+24 = 47.
It probably is 18 because if divided by 2 they are 3, 5, 7, 9, 11 and 13 but 9 is not a prime number
A number sequence is not a question. So there can be no "answer".
17
23
5+5 = 10 10+5 = 15 15-5 = 15 10+5 = 15
5
5
it has to be 11
5
the answer should be 5
Multiply each number by 5
11.
They are a sequence of odd numbers. The next three in the sequence would be 17,19 & 21