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Full marks =50 if 30 marks =30/50=3/5 if 35 marks =35/50=7/10

if there are 2 answers to this question then it is probability for coming 30=3/5 probability for coming 35=7/10 but if it is a single answer then i may take a guess .

Since no negative marks are given in the test, Possible outcomes=(0,1,2,3,4.........50) Number of possible outcomes=51 Probability of scoring 30=1/51 (since there is only 1 chance of 30 coming) Probability of scoring 35=1/51 (same reason as above) Total probability=1/51+1/51=2/51. Ans:The probability that he scores 30 marks or 35 marks is 2/51.