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2 years ago

11

There are 9 girls and 11 boys in a class, and two students will be chosen one after another. Find the probability that both are

boys.

1 answer:

ddd [48]2 years ago

3 0

Answer:

11/20

Step-by-step explanation:

total=20

11=boys

9=girls

p(b)=11/20

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Step-by-step explanation:

From the question we are told that

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Generally the echelon reduction is mathematically applied as

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Add -1/8 times the 3rd row to the 2nd row

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$\begin{Vmatrix}1 & 3 & 0&49/41&165/41\\0 & 1 & 0&1/41 &-5/41\\0&0 & 1 & -8/41& -42/41\end{Vmatrix}$

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