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help with probability question! please!!?

Q: 90 students will graduate from san marcos high school this year. Out of the 90 grads, 70 are planning on going to college. Two students are selected at random to carry the flag at graduation. What is the probability that:

a) BOTH of them are planning to attend college?

b) NONE of them are planning to attend college?

Thanks in advance!

1 Answer

Relevance
  • ?
    Lv 7
    9 years ago

    a.

    70/90 * 69/89

    b.

    30/90 * 29/89

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