105, 85, 60, 30, 0, -45, -90

Each number is a composite number except 11.

Subtract 1, 3, 5, 7, 9, 11 from successive numbers.

So, 34 is wrong.

1, 1 + 1² = 2, 2 + 2² = 6, 6 + 3² = 15, 15 + 4² = 31, 31 + 5² = 56, 56 + 6² = 92

Last number of given series must be 92 not 91.

The numbers are 1 ³, 2 ³, 3 ³, 4 ³ etc. So, 124 is wrong; it must have been 5 ³ i.e., 125.

Go on adding 5, 8, 11, 14, 17, 20.

So, the number 47 is wrong and must be replaced by 46.

Terms at odd places are 5, 6, 7, 8 etc. and each term at even place is 16.

So, 9 is wrong.

Prime numbers 2, 3, 5, 7, 11, 13 are to be added successively.

So, 165 is wrong.

The terms are successively divided by 12, 10, 8, 6, ...etc.

So, 24 is wrong, it should be 8 (48/6 = 8).

The differences between two successive terms from the beginning are 7, 5, 7, 5, 7, 5.

So, 40 is wrong.

The terms are alternatively multiplied by 1.5 and divided by 3. However, 18.5 does not satisfy it.