In which field did the Late Ved Prakash Nanda make

Three of the following four number-clusters are alike in a certain way and thus form a group. Which is the one that does not belong to that group?

Four of the following five are alike in a certain way based on a group, which among the following does not belong to that group?

Find the odd one out

Four letter-clusters have been given, out of which three are alike in some manner and one is different. Select the letter cluster that is different.

Select the odd letters from the given alternatives?

Find the odd one out

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 odd one out.

1) Brick 2) Heart 3) Club 4) Spade

Select the odd letters from the given alternatives?

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.