If you do not need so as to add the MoreLinq library to the challenge just to get the DistinctBy functionality then you can get a similar end result using the overload of Linq's Distinct approach that will take in an IEqualityComparer argument. If It is impossible with LINQ, what https://propertyingurugram.in/shapoorji-pallonji-real-estate-and-sbi-sign-mou-to-offer-faster-home-loan-approvals-to-homebuyers/