Question

What reasons does he give to Sergei for his telling lies?​

Answer 1

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Lushkoff says that he was sent away from the Russian choir because of him being an alcoholic. He tells lies because if he would tell this truth, no one would ever help him or give him money.

Answer 2

The beggar (his name was Lushkoff) gives reason to Sergei (an advocate) for his telling lies that nobody give him anything if he tells the truths. So he tells lies to get some money as help.