ProbabilityHard
Question
A letter is known to have come either from ″KRISHNAGIRI″ or ″DHARMAPURI″. On the post mark only the two consecutive letters ″RI″ are visible. Then the chance that it came from Krishnagiri is:
Options
A.3/5
B.2/3
C.9/14
D.none
Solution
KRISHNAGIRI or DHARMAPURI
A = R1 is visible
B1 = its from KRISHNAGIRI
B2 = its from DHARMAPURI
P(B1/A) =
A = R1 is visible
B1 = its from KRISHNAGIRI
B2 = its from DHARMAPURI
P(B1/A) =
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