Twenty identical looking packets of white power are such that 15 contain cocaine and 5 do not. four packets were randomly selected, and the contents were tested and found to contain cocaine. two additional packets were selected from the remainder and sold by undercover police officers to a single buyer. what is the probability that the 6 packets randomly selected are such that the first 4 all contain cocaine and the 2 sold to the buyer do not?

The probability of selecting randomly 6 packets such that the first 4 contain cocaine and 2 not is 0.3522.

Step-by-step explanation:

Probabilities of selecting 4 packets with the ilegal substance:

=

Combinassions possible= 1365

Probabilities of selecting 2 packets with white powder:

=

Combinations possible= 10

Probabilities of selecting 6 packets from the totality of them:

=

Combinations possible= 38760

The probability of picking 4 with the substance and 2 with only white powder is:

= 0.3522

I hope this answer helps you.

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step-by-step explanation: