Let two fair six-faced dice A and B be thrown simultaneously. If E 1 is the event that die A shows up four,…

Let two fair six-faced dice A and B be thrown simultaneously. If E1 is the event that die A shows up four, E2 is the event that die B shows up two and E3 is the event that the sum of numbers on both dice is odd, then which of the following statements is not true?
  1. E1 and E3 are independent
  2. E1, E2 and E3 are independent
  3. E1 and E2 are independent
  4. E2 and E3 are independent

Solution

E1A show up 4

E2B shows up 2

E3  Sum is odd (i.e., even + odd or odd + even)

PE1=66.6=16

PE2=66.6=16

PE3=3.36.6+3.36.6=24=12

PE1E2=16.6=PE1 . PE2

E1 & E2 are independent

PE1E3=1.36.6=PE1 . PE3

E1 & E3 are independent

PE2E3=1.36.6=112=PE2 . PE3

E2 & E3 are independent

PE1E2E3=0 P(E1)×P(E2)×P(E3) 

Asked in: JEE Main 2016 (03 Apr)

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