Use the following information for 15 through 20. A bag contains 6 balls with the following colors: red, white, blue, yellow, green, and orange. You cannot see into the bag and all balls have the same feel, so the selections are random. 15. If four balls are picked out (without replacement), how many different permutations can there be? 16. If three balls are picked out (without replacement), how many different combinations can there be? 17. If two balls are picked (without replacement), what is the probability that one will be red and the other blue?

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Q: 2. P =

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A: pick 9 numbers from 1 to 40. order doesn't matter. no. of ways to choose = ?

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Q: C4

A:

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A: Arrangement classification- Permutation or Combination

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A: We know that  We can arrange n people  n!= n×(n-1)×(n-2) .........2×1

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