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Explanation:

Let the percentage of students who passed in both the subjects is 'x' and those who failed in both the subjects is 'n'.

Now, P ∪ M = P + M - P ∩ M

⇒ 100 - n = 60 + 68 - x

⇒ x = n + 28

x will be least when n is least. Least value of n can be 0, hence least value of x = 28

Hence, 28.

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