A box of light bulbs contains exactly 3 light bulbs that are

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BTGmoderatorDC: Moderator; Posts: 7187; Joined: Thu Sep 07, 2017 4:43 pm; Followed by:23 members

A box of light bulbs contains exactly 3 light bulbs that are

by BTGmoderatorDC » Thu Dec 12, 2019 12:38 am

A box of light bulbs contains exactly 3 light bulbs that are defective. What is the probability that a sample of light bulbs picked at random from this box will contain at least 1 defective light bulb?

(1) The light bulbs in the sample will be picked 1 at a time without replacement.
(2) The sample will contain exactly 20 light bulbs.

OA E

Source: Official Guide

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