Each number is a composite number except 11.
The pattern is 1 x 3, 2 x 5, 3 x 7, 4 x 9, 5 x 11, 6 x 13, 7 x 15 etc.
So 70 is not correct.
Alternetly, we add 4 and double the next. So, 132 is wrong. It must be (68 x 2) i.e., 136.
The number are cubes of primes i.e., 23, 33, 53, 73, 113. Clearly, none is wrong.
Numbers are alternately multiplied by 2 and increased by 3. So, the missing number = 61 x 2 = 122.
Number are all primes. The next prime is 43.
Subtract 20, 25, 30, 35, 40, 45 from successive numbers. So 0 is wrong.
There are two series (8, 11, 14, 17, 20) and (7, 12, 17, 22). Increasing by 3 and 5 respectively.
Number are alternately multiplied by 3 and divided by 2. So, next number = 54 / 2 = 27.
Each number is double the preceding one plus 1. So, the next number is (255 x 2) + 1 = 511.
There are two series, beginning respectively with 3 and 7. In one 3 is added and in another 2 is subtracted. The next number is 1 - 2 = - 1.
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