The number which best completes the sequence below is:1 1 3 2 4 6 5 25 ?
The sequence appears to alternate between adding and subtracting numbers. The pattern seems to be +11, -7, +5, -2, +6. Following this pattern, the next number in the sequence would be +3 from the previous number, which would be 21.
25
Unless you specify the length of the sequence, it is infinite, and so no number completes it. Given no further information, I would say the next number is 18. However, check out the link to the OEIS which gives a number of alternatives.
The sequence appears to be alternating between addition and subtraction operations. Starting with 7, we subtract 6 to get 1, then add 4 to get 5, subtract 8 to get -3, and then add 10 to get 7. Following this pattern, the next operation would be subtraction, so we subtract 12 from 7 to get -5. Therefore, the number that best completes the sequence is -5.
18
13 20 12
18 (3+1 4+2 6+3 9+4 13+5)
18
18
The difference between consecutive numbers is 1, 2, 3, 4. So the next difference will be... Added to 13 gives...
The number which best completes the sequence below is:1 1 3 2 4 6 5 25 ?
9
It is 24+7 = 31
(plus) + 4 (minus) - 3
Continuing the sequence would be the the numbers 24, 31, 39.
you need to put commas.