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A die is thrown three times and the sum ...

A die is thrown three times and the sum of the 3 numbers shown is 15. The probability that the first throw was a four, is

A

`(1)/(5)`

B

`(1)/(4)`

C

`(1)/(6)`

D

`(2)/(5)`

Text Solution

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The correct Answer is:
(a)
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ARIHANT MATHS-PROBABILITY-Exercise For Session 1
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  2. A die is thrown three times and the sum of the 3 numbers shown is 15. ...

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  3. Three faces of a fair die are yellow, two faces red and one blue. The ...

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  4. A speaks truth in 75% of cases and B in 80% of cases. The percentage o...

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  5. An unbiased die with faced marked 1, 2, 3, 4, 5, and 6 is rolled four ...

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  6. Three numbers are chosen at random without replacement from {1,2,3,......

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  10. Three identical dice are rolled. The probability that same number appe...

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  14. There are 2 vans each having numbered seats, 3 in the front and 4 at t...

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  15. A and B stand in a ring with 10 other persons. If the arrangement of t...

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  16. The first 12 letters of English alphabet are written down at random in...

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  17. Six boys and six girls sit in a row randomly. Find the probability tha...

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  18. If from each of the three boxes containing 3 white and 1 black, 2 whit...

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  19. The probability that an year chosen at random has 53 Sundays is :

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