CBSE Class 12-science Answered
Event-1 :- First time black ball is drawn and second time also black ball is drawn ( B+B)
probability of selecting black ball first time is 6/10 ; probability of selecting black ball second time is 5/9 ;
probability of not selecting red ball is , P(B+B) = (6/10) × (5/9) = 1/3
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Event-2 :- First time black ball is drawn and second time red ball is drawn ( B+R)
probability of selecting black ball first time is 6/10 ; probability of selecting red ball second time is 4/9 ;
probability of selecting black ball first and red ball next is , P(B+R) = (6/10) × (4/9) = 4/15 ;
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Event-3 :- First time red ball is drawn and second time black ball is drawn ( R+B)
probability of selecting red ball first time is 4/10 ; probability of selecting black ball second time is 6/9 ;
probability of selecting red ball first and black ball next is , P(R+B) = (4/10) × (6/9) = 4/15 ;
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Event-1 :- First time red ball is drawn and second time also red ball is drawn ( R+R )
probability of selecting red ball first time is 4/10 ; probability of selecting red ball second time is 3/9 ;
probability of selecting red ball both time is , P(R+R) = (4/10) × (3/9) = 2/15
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Event | B+B | B+R | R+B | R+R |
X | 0 | 1 | 1 | 2 |
P(x) | 1/3 | 4/15 | 4/15 | 2/15 |
X P(X) | 0 | 4/15 | 4/15 | 4/15 |