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Yanka [14]
3 years ago
8

A bag contains 5 red cubes and 7 white cubes. celinda will select one cube put it in her pocket and select a second cube which e

xpression gives the probability that she will select two red cubes ?
(a-5/12 x 5/12
(b-5/12 x 4/12
(c-5/12 x 5/11
(d-5/12 x 4/11
-Sky
Mathematics
2 answers:
andrezito [222]3 years ago
7 0
If she picked a red cube then there would be 4 red ones and from 12 cubes there would be 11 left
 so the answer is D 5/12 x 4/11
sergij07 [2.7K]3 years ago
5 0
I’d say D.) but I’m not entirely sure it’s been a while since I did this but I did it lol good luck
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Step by step explanation:

\text{Given that,}\\\\~~~~~~\sin A = \dfrac 38 \\\\\implies \sin^2 A = \dfrac 9{64}\\\\\implies  1 - \cos^2 A = \dfrac{9}{64}\\\\\implies \cos ^2 A = 1 - \dfrac 9{64}\\\\\implies \cos^2 A = \dfrac{55}{64}\\\\\implies \cos A =\pm\sqrt{\dfrac{55}{64}}\\ \\\implies \cos A = \pm\dfrac{\sqrt{55}}8\\\\

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\text{Now,}\\\\\csc A - \sec A\\\\=\dfrac{1}{\sin A}- \dfrac{1}{\cos A}\\\\=\dfrac 83 -\left(\pm \dfrac 8{\sqrt {55}} \right)\\ \\\text{Hence,}\\\\\csc A - \sec A = \dfrac 83 + \dfrac{8}{\sqrt{55}}\\\\\csc A - \sec A = \dfrac 83 - \dfrac{8}{\sqrt{55}}

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