Question

Four dice are rolled then the probability atleast one digit on the dice must be repeated is

Answer 1

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12th

Maths

Probability

Events and Its Algebra

Four dice are rolled, then ...

MATHS

Four dice are rolled, then the probability that at least one digit on the dice must be repeated is

December 20, 2019

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Cheshta Somaiya

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ANSWER

Counting cases where no digit is repeated choices for 1st dice =6

Choices for 2nd dice =5

Choices for 3trd dice =4

Choices for 4th dice =3

⇒ P=

6×6×6×6

6×5×4×3

=

6

5

×

3

2

×

2

1

=

1

5

Required probability =1−P

=

18

13