If Mean is 39, Median is 40, what is the value of Mode?

Select the odd number from the given alternatives:

Find the odd one out from the following options. 

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

Four of the following five are somehow similar and therefore create a group. Which is not related to this group?

ZD, LP, WA, UQ, KO

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.

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

Find out the odd word/letters/number/number pair from the given alternatives.

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

Find the 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.