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A box in a supply room contains 15 compat fluorscent lightbulbs, of wich 5 are rated...

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Question

Basic Math

A box in a supply room contains 15 compat fluorscent lightbulbs,of wich 5 are rated 13 watt, 6 are rated 18 watt, and 4 are rated23 watt. Suppose that three bulbs are randomly slected.

a- What is the probablity that exactly two of the slected bullbsare rated 23 watt?

b- What is the probablity that all of the three slected bulbshave the same rating?

c- What is the probablity that one of each type is slected ?

Answer & Explanation Solved by verified expert
3.9 Ratings (628 Votes)
The probability of selecting 13W bulb 18W bulb and 23W bulb isgiven as followsa There are six    See Answer
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