the rule is plus 4 divided by 3 plus 4 divided by two
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Answer #2:
The missing number is 8. It belongs between 24 and 12 .
The rule is: Add 4, divide by 3, rinse and repeat.
55
6 x2 12 x4 48 x2 96 x4 384
The rule of this pattern is -2 + 6 +4 so the next number would be 16.
Digits in each number are increasing. 456, 6789, and 12 would also fit in this pattern
12
55
6 x2 12 x4 48 x2 96 x4 384
The pattern rule is: 4 5 6 7 8 and so the next number will be 33+9 = 42
The rule of this pattern is -2 + 6 +4 so the next number would be 16.
Digits in each number are increasing. 456, 6789, and 12 would also fit in this pattern
This missing number is 5
12
71 because the pattern is 100-15=85-14=71-13=58-12=46
The answer depends on where, within the sequence, the missing number should have been.
Any number can be the missing number.If you want:1: then try the rule: U(n) = (35*n^3 - 245*n^2 + 466*n - 136)/22: then try the rule U(n) = 17n^3 - 119*n^2 + 226*n - 643: then try the rule: U(n) = (33*n^3 - 231*n^2 + 438*n - 120)/24: then try the rule U(n) = 16n^3 - 112*n^2 + 212*n - 56and so on.Having said that, the simplest linear rule is U(n) = 72 - 12n, which gives 36 as the missing number.
The number keeps being revised. As of 16 January 2011, the number of missing has dropped to 12. Just five days previously, the number of missing was over 90.
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