If we assume that students study only for 3 years, then the answer
should be D
3rd year: 40%
2nd year: x
1st year: y
y + 40 = 70 implies y = 30
If y = 30, x = 30 as 40 + x + y = 100
So, y / (x+y) = 30 / 60 = 1/2
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Probability.
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