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

Option 3 : dwfv

The position values of letters according to the English alphabet series:

[ alt="Positional value Table" src="//storage.googleapis.com/tb-img/production/22/04/Positional%20value_Table.png" style="width: 490px; height: 103px;">

The pattern followed here is:

Option (1): [ alt="F1-Savita SSC 16-5-22 D18" src="//storage.googleapis.com/tb-img/production/22/05/F1-Savita_SSC_16-5-22__D18.png" style="width: 178px; height: 80px;">

Option (2): [ alt="F1-Savita SSC 16-5-22 D25" src="//storage.googleapis.com/tb-img/production/22/05/F1-Savita_SSC_16-5-22_D25.png" style=" width: 178px; height: 80px;">

Option (3): [ alt="F1-Savita SSC 16-5-22 D26" src="//storage.googleapis.com/tb-img/production/22/05/F1-Savita_SSC_16-5-22_D26.png" style="width: 177px; height: 83px;">

Option  (4): [ alt="F1-Savita SSC 16-5-22 D27" src="//storage.googleapis.com/tb-img/production/22/05/F1-Savita_SSC_16-5-22_D27.png" style=" width: 178px; height: 80px;">

Here, "dwfv" do not follow the pattern. so, it is different from other three.

Hence, the correct answer is "dwfv".