Grid failure brings five hundred trains to a

Number of letters skipped in between adjacent letters goes on increasing successively by three in the series. Identify the set following the above rule.

Odd one out

Select the odd letters from the given alternatives?

Four numbers have been given, out of which three are alike in a certain way and one is different. Select the one that is different.

Find the one which does not belong to that group?

Find the odd set of numbers from the given alternatives.

Which of the following is odd one out?

Four number-pairs have been given, out of which three are alike in some manner and one is different. Select the number-pair that is different.

Select the letter cluster which does not belong to the same group from the given alternatives.

Find the odd one out.