Subtract 20, 25, 30, 35, 40, 45 from successive numbers. So 0 is wrong.

Correct Option: A

Subtract 20, 25, 30, 35, 40, 45 from successive numbers. So 0 is wrong.

Each number is double the preceding one plus 1.

Correct Option: B

Each number is double the preceding one plus 1. So, the next number is (255 x 2) + 1 = 511.

Number are alternately multiplied by 3 and divided by 2. So, next number = 54 / 2 = 27.

Correct Option: A

Number are alternately multiplied by 3 and divided by 2. So, next number = 54 / 2 = 27.

There are two series (8, 11, 14, 17, 20) and (7, 12, 17, 22). Increasing by 3 and 5 respectively.

Correct Option: B

There are two series (8, 11, 14, 17, 20) and (7, 12, 17, 22). Increasing by 3 and 5 respectively.

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.

Correct Option: C

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.