what is the number pattern 17-23-?-18-20-25-21-9-15-16?

it is the keyboard patern to the alfabet

It looks random (patternless) to me.

To find the missing number in the pattern 17-23-?-18-20-25-21-9-15-16, let's analyze the given sequence.

Looking closely, we can observe that the numbers in the pattern seem to be arranged in groups of three. Let's examine each group:

Group 1: 17-23-?
Group 2: 18-20-25
Group 3: 21-9-15
Group 4: 16

In Group 1, by subtracting 17 from 23, we get 6.

Group 2 doesn't seem to have a clear pattern.

Group 3, however, presents a clear pattern. The first number (21) minus the second number (9) gives us 12, and the second number minus the third number (15) gives us -6. Therefore, in Group 3, the pattern seems to be subtraction by 6.

In Group 4, we only have one number, so we can't identify any pattern here.

To determine the missing number, let's continue the pattern we discovered in Group 3. The third number (15) minus 6 gives us 9. So, the missing number in the sequence is 9.

Therefore, the number pattern can be completed as follows: 17-23-9-18-20-25-21-9-15-16.