• Why is freeway paving sometimes concrete and sometimes asphalt?

    In southern California, and probably elsewhere, freeways are paved with both concrete and asphalt, seemingly at random. I know that the roadway surface on a concrete bridge is concrete, but in other places, why is concrete used sometimes and asphalt used other times? And why do they alternate?
    In southern California, and probably elsewhere, freeways are paved with both concrete and asphalt, seemingly at random. I know that the roadway surface on a concrete bridge is concrete, but in other places, why is concrete used sometimes and asphalt used other times? And why do they alternate?
    9 answers · Engineering · 1 decade ago
  • What is the probability that 2 M&Ms have the same color when 3 are drawn?

    I've got a large bag of M&Ms, large enough that the supply can be considered infinite. Furthermore, I'll assume that all six colors I observe are in the same quantity. If I take 3 M&Ms from the bag, what is the probability that two, and only two, M&Ms are the same color? What is your reasoning?
    I've got a large bag of M&Ms, large enough that the supply can be considered infinite. Furthermore, I'll assume that all six colors I observe are in the same quantity. If I take 3 M&Ms from the bag, what is the probability that two, and only two, M&Ms are the same color? What is your reasoning?
    9 answers · Mathematics · 1 decade ago