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Mathematics 12 Online
OpenStudy (anonymous):

Probability A box contains 15 bulbs. 5 are defective. If i randomly select 4 bulbs, what is the probability of 4 bulbs being defective? Why the answer is NOT: 5/15 * 4/14 * 3/13 * 2/12 ? Is it related to the fact of 4 bulbs being simultaneously selected rather sequentially? Please explain.

OpenStudy (anonymous):

5C4/ 15C4

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