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Step-by-step explanation:

After a red 3, the highest possible sum is 3 + 6 = 9.

So P(sum ≥ 10) = 0 after a red 3 has occurred.

There are 5 ways the sum can be greater than or equal to 10 (4 and 6, 6 and 4, 5 and 5, 5 and 6, 6 and 5).  There are a total of 36 possible permutations.  Therefore:

P(sum ≥ 10) = 5/36

The conditional probability is:

P(sum ≥ 10 | red 3) = P(sum ≥ 10 AND red 3) / P(red 3)

P(sum ≥ 10 | red 3) = 0 / (1/6)

P(sum ≥ 10 | red 3) = 0

you estimate that the angle of elevation to the top of the 86th floor (the observatory) is 82 .the total height of the building is another 123 meters above the 86th floor.

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