A series is given, with one word missing. Choose the correct alternative from the given ones that will complete the series.

Laugh, Alter, Melts, Realm, Muesli, ?

Select the odd number from the given alternatives.

Select the odd letters from the given alternatives.

Select the odd word from the given alternatives.

Select the related number from the given alternatives.

236 : 472 :: 123 : ?

Select the related letters from the given alternatives.

DGI : JMO :: RUW : ?

Select the related word from the given alternatives.

Pencil : Lead :: Pen : ?

The headquarters of RBI is in