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Numerical Ability
Probability
The Probability of finishing a test on time by A is 1/2,B is 2/3 and by C is 3/5.If all of them write the test independently , ten what is the probability that just two of them are able to write the test on time.
a)1/2 b)3/10 c)13/30 d)1/3
Read Solution (Total 4)
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- Ans:13/30
Two of them means AB(C~)+(~A)BC+A(~B)C
(1/2)(2/3)(2/5) + (1/2)(2/3)(3/5) +(1/2)(1/3)(3/5) =13/30 - 8 years agoHelpfull: Yes(18) No(1)
- Ans is 13/30...... (1/2)*(2/3)*(2/5)+(1/2)*(2/3)*(3/5)+(1/2)*(1/3)*(3/5)= 13/30
- 8 years agoHelpfull: Yes(4) No(1)
- option (c)
- 8 years agoHelpfull: Yes(0) No(0)
- 1/2*2/3*2/5+1/2*2/3*3/5+1/2*1/3*3/5
- 2 years agoHelpfull: Yes(0) No(0)
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