1/6
Step-by-step explanation:
We ared told the odds against an event = 5 to 1
odd against = number of times it won't occur/ number of times it will occur
Odds in favour of the event occurring = inverse of odds against the event
Odds in favour of the event occurring = number of times it will occur/ number of times it won't occur
Odds in favour of the event occuring = 1 to 5
Probability of the event occurring:

Hence, the Probability of the event occurring is 1/6