50 students go bushwalking, 23 get sunburnt 22 get bitten by ants and 5 are both sunburnt and bitten

50 students go bushwalking, 23 get sunburnt 22 get bitten by ants and 5 are both sunburnt and bitten. Determine the probability that a randomly selected student:
a)escaped being bitten.
b)was either bitten or sunburnt.
c)was bitten, given that he or she was sunburnt.
Note: Please provide workings.

 

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