# In Prob. 3 find the probability of E: At least 1 defective (i) Directly (ii) By using

## Question:

In Prob. 3 find the probability of E: At least 1 defective

(i) Directly

(ii) By using complements; in both cases (a) and (b).

**Data from Prob. 3**

Three screws are drawn at random from a lot of 100 screws, 10 of which are defective. Find the probability of the event that all 3 screws drawn are nondefective, assuming that we draw

(a) With replacement

(b) Without replacement.

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