According to me the answer to this is x = 1/6 * 1 + 5/6 (x+1) it gives value as x=6 correct me if i am wrong
Dice expectations - 1
As the probability of each number on a dice is 1/6 meaning by theory every number can occur at least once in 6 throws, hence not only 4 but for every number answer would be 6 throws to get 1 occurence at least going by the theory.
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