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Marina CMI [18]
3 years ago
9

Ten of 16 students in Nyack's class are girls. His teacher selected two helpers by randomly drawing names. He drew a boys name f

irst and then a girls names. Nyack thinks that the probability of this happening is 15/64. Is he correct? If not, Explain his error.
Mathematics
1 answer:
katrin [286]3 years ago
7 0

|\Omega|=16\cdot15=240\\|A|=6\cdot10=60\\\\P(A)=\dfrac{60}{240}=\dfrac{1}{4}

He's wrong.

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3 years ago
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Hey there!

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3. (s-2) + (s-2) + (s-2) + (s-2) + (s-2) Each grouping in the parenthesis represents each of the 5 sides, so adding them all together will get you the perimeter.

4. 5(s) + 5(-2) This one is most like the first one, except it's a little more spread out. Multiply the term s by the 5 sides in one grouping, and the integer -2 by 5 in the other.

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