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help in AS MATH statistics

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sir i need help in s1..
Kevin hosts the TV programme Thank Your Lucky Stars. During the show he picks members of the large studio audience at random and asks them what star sign they were born under. (There are 12 star signs in all and you may assume that the probabilities that a randomly chosen person will be born under each star sign are equal)
-> Show that the probability that the first three people picked were all born under different star signs is approximately 0.764
The probability of the first person being chosen is unique is:
12/12 since no other member has been chosen yet
The probability for the 2nd person would be:
11/12 since one has already been chosen
and for the 3rd it is:
10/12 (2 are already chosen)
Multiplying all three: (12/12) x (11/12) x (10/12) = 0.764
 
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