math

From a shipment of 75 transistors, 6 of which are defective, a sample of 5 transistors is selected at random.
(a) In how many different ways can the sample be selected?
ways

(b) How many samples contain exactly 3 defective transistors?
samples

(c) How many samples do not contain any defective transistors?
samples

  1. 👍 0
  2. 👎 0
  3. 👁 249
  1. (a) 75C5

    (b) 69C2 * 6C3

    (c) 69C5

    1. 👍 1
    2. 👎 0
  2. In B and C where did the 69 come from?
    in B where did the also come from

    1. 👍 0
    2. 👎 0

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