If ECD = 24 and HGF = 42, then JKFG =

Select the option that is related to the third number in the same way as the second number is related to the first number.

72 : 252 :: 126: ?

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

Select the option that is related to the third letter cluster in the same way as the second cluster is related to the first cluster.

Given set:  [20, 82, 31]

Statement:

Some keyboards are mouse

Only a few dashboards are pianos

All pianos are mouse

Conclusion:

Three of the following four number pairs are alike in some manner and one is different. Identify the one which is different.

Select the related word/letters/number from the given alternatives.

CF : JM :: QT : ?