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MAVERICK [17]
3 years ago
7

There are 9 students in a class: 5 boys and 4 girls. If the teacher picks a group of 4 at random, what is the probability that e

veryone in the group is a boy?
Mathematics
1 answer:
sesenic [268]3 years ago
6 0

Answer:

The probability is 0.0397.

Step-by-step explanation:

There are 9 students in a class: 5 boys and 4 girls.

The teacher picks a group of 4 at random.

So, the probability that everyone in the group is a boy is given by :

(5/9)(4/8)(3/7)(2/6)=120/3024=0.0397

Or (5C4)/(9C4)=0.0397

Hence, the probability is 0.0397.

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If you multiply 5 and 1.6, you get 8.

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The owner of a new pet store wishes to display tropical fish in display tanks. The above table shows the species that cannot liv
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Now the B species, it can live with A, F and G, but for this example we can put in the tank 1 (the tank of the A species). The C especies can live with A, F and G, but how we have A and B together, we're gonna put the C especies in the tank 3 (the tank of the G especies). The D species can live with A and G, we're gonna put in the tank 1 because can live with B species too. The E species can live with A and F, we're gonna put in the tank 2 (the tank of the F species) because the E species can't live with D that is in the in the tank 1. Al last, the H species just can live with A, E, F, and H species, by this reason, the only tank that can be put is the tank 2. In this form, the order is the next:

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And t<u>he owner of the pet store must buy three different tanks to display these tropical fish</u>.

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