Question: A Math class has only 4 students (A, B, C and D) and they independently attend the class. The probability of them attending is 0.5,

A Math class has only 4 students (A, B, C and D) and they independently attend the class. The probability of them attending is 0.5, 0.6, 0.7, and 0.75, respectively. Find the 1 probability that the total number of attendance on 2 consecutive days is exactly 4?

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