School and Work

In a promotion, 50 silver dollars are placed in a bag, one of which is valued at more than $10,000. The winner of the promotion is given the opportunity to reach into a bag, while blindfolded, and pull out five coins. what is the probability that 1 of the 5 coins is the one valued at more than $10,000?

I believe this to be either a permutation problem or combination problem but I have a hard time deciphering what makes them different.

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a)Laura, Dave, Monique, Marcus and Sarah are going to a party. What is the probability that two of the girls will arrive first?
b) What is the probability that the friends will arrive in order of ascending age?
c) What assumptions must be made in parts a) and b)

how do i solve these, can someone explain me the steps? the answers are:
a) 3/10
b) 1/20
c) Assuming that the friends arrive individually

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