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Jan 19, 2018 at 2:59 comment added Bjørn Kjos-Hanssen @SoheilFeizi yes I suppose you could work with a formula for $E(X^k)$ as a function of $k$, and the multinomial theorem
Jan 18, 2018 at 17:32 comment added Soheil Feizi Thanks. yes I did this calculation as well. Any ideas for a more general case?
Jan 18, 2018 at 8:29 history answered Bjørn Kjos-Hanssen CC BY-SA 3.0