The sequence interval is 2 4 6 8 ( this is the difference of number). so the missing number is -1 if I'm not mistaken.
37.
These are in groups of 4, each in the sequence n, n-2, n-3, 2(n-3). So the series continues after 25: 23, 22, 44. So the number after 25 is 23
23
24
23
The sequence interval is 2 4 6 8 ( this is the difference of number). so the missing number is -1 if I'm not mistaken.
The next number in the sequence would be 23. The sequence consists of prime numbers.
37.
If the question is, What is the missing number in the sequence 7, 11, 23, ?, 167? Then each number is 3 times the previous number then deduct 10. 3 x 7 = 21 - 10 = 11 3 x 11= 33 - 10 = 23 3 x 23 = 69 - 10 = 59......the missing number 3 x 59 = 177 - 10 = 167 3 x 167 = 501 - 10 = 491....the next number in the sequence.
These are in groups of 4, each in the sequence n, n-2, n-3, 2(n-3). So the series continues after 25: 23, 22, 44. So the number after 25 is 23
The pattern is +5, +6, +7, so the next number will be 23 + 8 or 31.
23
24
63
15
If you mean... -7+x*2=23 then x = 15. Done without the aid of a calculator ! The value of 'x' (the unknown number) MUST equal 30, because 30-7=23 - SO, half the unknown number must be 15!