Why does slim find it so that George and Lennie string along together What reason does he give for finding this odd?

Slim finds it odd that George and Lennie stick together because it is uncommon for two men to form such a close bond while working as ranch hands. Slim is used to seeing workers traveling alone and keeping to themselves, which makes George and Lennie's relationship stand out to him. He admires their friendship and sees the value in their loyalty to each other.