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Numerical Ability
Probability
In a horse racing competition there were 18 numbered 1 to 18.the organisers assigned a probablity of winning the race to each horse such that horse1 would win is 1/7,for horse 2 it is 1/8 and for horse 3 it is 1/8.Assuming that tie is not possible.find chance that one of these three will win the race???
ans-23/56
Read Solution (Total 9)
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- p(AUBUC)=P(A)+P(B)+P(C)-(P(A^B)+P(A^C)+P(B^C))+P(A^B^C)
= 1/7+1/8+1/8-1/56-1/64-1/56+1/392
=154/392
=22/56 - 9 years agoHelpfull: Yes(10) No(5)
- as there cannot be a tie, the probability is 1/7+1/8+1/8=22/56
- 9 years agoHelpfull: Yes(10) No(4)
- Given 3 events are mutually exclusive so
p(AUBUC)=P(A)+P(B)+P(C)-(P(A^B)+P(A^C)+P(B^C))+P(A^B^C)
=1/7+1/8+1/8-0-0-0+0 (bcaz events are mutually exclusive so intersections are 0)
=22/56
=11/28 - 9 years agoHelpfull: Yes(6) No(1)
- answer is 19/64
- 9 years agoHelpfull: Yes(6) No(0)
- The chances of Horse No 1 winning 1/7 Probability of horse No 1 not winning 6/7
The chances of horse No 2 winning 1/8 Probability of horse No 2 not winning 7/8
The chances of horse No 3 winning 1/8 Probability of horse No 3 not winning 7/8.
The chances of any one of these three horses winning the race will be:
(A winning, B and C not winning) + (B winning and C and A not winning) + (C winning and A and B not winning)
Now substituting the relevant information in the above we get the following.
Probability of any one of the three horses winning is arrived at as
(1/7 + 7/8 + 7/8) + ( 1/8 + 6/7 + 7/8) + ( 1/8 + 6/7 + 7/8) Reducing this we get the value
Of probability of any one of these three horses winning as 19/64. - 9 years agoHelpfull: Yes(4) No(1)
- Probability of Horse 1, 2 and 3 winning is 1/7, 1/8, 1/8 respectively.
Probability of Horse 1, 2 and 3 not winning is (1-1/7), (1-1/8), (1-1/8) i.e., 6/7, 7/8,7/8 respectively.
There are three possible situations which will satisfy the given conditions:
a) Horse 1 win and horses 2 and 3 lose. Probability of this event happening = (1/7*7/8*7/8) = 7/64
b) Horse 2 win and horses 1 and 3 lose. Probability of this event happening = (6/7*1/8*7/8) = 6/64
c) Horse 3 win and horses 1 and 2 lose. Probability of this event happening = (6/7*7/8*1/8) = 6/64
Hence, the required probability is = (7/64 + 6/64 + 6/64) = 19/64. - 8 years agoHelpfull: Yes(3) No(0)
- Required prob= (1/7)(1-1/8)(1-1/8)+(1/8)(1-1/7)(1-1/8)+(1/8)(1-1/7)(1-1/8)
=(1/7)(7/8)(7/8)+(1/8)(6/7)(7/8)+(1/8)(6/7)(7/8)
=61/64 - 9 years agoHelpfull: Yes(2) No(2)
- Probability of Horse 1, 2 and 3 winning is 1/7, 1/8, 1/8 respectively.
Probability of Horse 1, 2 and 3 not winning is (1-1/7), (1-1/8), (1-1/8) i.e., 6/7, 7/8,7/8 respectively.
There are three possible situations which will satisfy the given conditions:
a) Horse 1 win and horses 2 and 3 lose. Probability of this event happening = (1/7*7/8*7/8) = 7/64
b) Horse 2 win and horses 1 and 3 lose. Probability of this event happening = (6/7*1/8*7/8) = 6/64
c) Horse 3 win and horses 1 and 2 lose. Probability of this event happening = (6/7*7/8*1/8) = 6/64
Hence, the required probability is = (7/64 + 6/64 + 6/64) = 19/64 - 8 years agoHelpfull: Yes(2) No(0)
- 1/7+1/8+1/8 =21/56
- 9 years agoHelpfull: Yes(1) No(2)
TCS Other Question
6. In Goa beach, there are three small picnic tables. Tables 1 and 2 each seat three people. Table 3 seats only one person, since two of its seats are broken. Akash, Babu, Chitra, David, Eesha, Farooq, and Govind all sit at seats at these picnic tables. Who sits with whom and at which table are determined by the following constraints:
a. Chitra does not sit at the same table as Govind.
b. Eesha does not sit at the same table as David.
c. Farooq does not sit at the same table as Chitra.
d. Akash does not sit at the same table as Babu.
e. Govind does not sit at the same table as Farooq.
Which of the following is a list of people who could sit together at table 2?
a. Govind, Eesha, Akash
b. Babu, Farooq, Chitra
c. Chitra, Govind, David.
d. Farooq, David, Eesha.
In how many ways can 2310 can be expressed as product of 3 factors??