Question

`Aa n dB` are two independent events. The probability that both `Aa n dB` occur is 1/6 and the probability that neither of them occurs is 1/3. Find the probability of the occurrence of `Adot` Select the correct answer from above options

Answer 1

Correct Answer - A::B::C Given, `P(A).P(B)=(1)/(6)(bar(A)).P(bar(B))=(1)/(3)` `:." "[1-P(A)][1-P(B)]=(1)/(3)` Let `" "P(A)=x" and "P(B)=y` `implies" "(1-x)(1-y)=(1)/(3)" and "xy=(1)/(6)` `implies" "1-x-y+xy=(1)/(3)" and "xy=(1)/(6)` `implies" "x+y=(5)/(6)" and "xy=(1)/(6)` `implies" "x((5)/(6)-x)=(1)/(6)` `implies" "6x^(2)-5x+1=0` `implies" "(3x-1)(2x-1)=0` `implies" "x=(1)/(3)" and "(1)/(2)` `:." "P(A)=(1)/(3)" or "(1)/(2)`