What is the probability of getting heads when flipping a coin and getting a number greater than or equal to 4 when rolling a single die

The probability of getting hears when flipping a coin is 1 in 2 or 50%.
The probability of getting a number greater than or equal to 4 when rolling a single 6-sided die is 2 in 6 or 1 in 3 or 33.33%

Then you multiply the two together to get a probability of 1 in 6 in 16.66%

Skew lines(segments) are lines(segments) in 3 dimensions that do not intersect the given segment and are not parallel to it.  ae, bf, eg, and fh are your skew segments.  i hope that : )