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Q. Two dice are thrown. If it is known that the sum of numbers on the dice was less than $6$ the probability of getting a sum as $3$ is

KCETKCET 2021Probability - Part 2

Solution:

$(1,1)(1,2)(1,3)(1,4)(2,1)(2,2)(2,3)$
$(3,1)(3,2)(4,1)$
$P(B)=\frac{10}{36}$
$n ( A )=(1,2)(2,1)$
$P ( A )=\frac{2}{36}$
$P \left(\frac{ B }{ A }\right)=\frac{\frac{2}{36}}{\frac{10}{36}}$
$=\frac{2}{10}=\frac{1}{5}$