If A1, A2, ... , A, are exhaustive and mutually exclusive events associated with a random experiment such that P(A; occurs) = P;, where p, + P2 + if the experiment is repeated n times, then the probability that A, occurs r¡ times, A2 occurs r, times, + Pk = 1, and .... Ag occurs r times is given by .... n! p{1x p2" ... P* .... where r + r2 + ... + rk =n.

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Prove the theorem

If A1, A2, ... , Ag are exhaustive and mutually exclusive events associated with a
random experiment such that P(A; occurs) = pP;, where p, + P2 + ...
if the experiment is repeated n times, then the probability that A, occurs r¡ times,
A2 occurs r, times,
+ Pk = 1, and
%3|
1
Ar occurs r, times is given by
•.•)
n!
rk
Pk
r2
Pi
P„(r], r2>
r):
r!r!..!
...
•..
where
rị + r2 + ... + ry = n.
Transcribed Image Text:If A1, A2, ... , Ag are exhaustive and mutually exclusive events associated with a random experiment such that P(A; occurs) = pP;, where p, + P2 + ... if the experiment is repeated n times, then the probability that A, occurs r¡ times, A2 occurs r, times, + Pk = 1, and %3| 1 Ar occurs r, times is given by •.•) n! rk Pk r2 Pi P„(r], r2> r): r!r!..! ... •.. where rị + r2 + ... + ry = n.
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