Question

1) in a box there are 6 red 2
masks and 5 green masks.
Two masks are picked
randomly one after the
other without
replacement. What is the
probability that both the
masks are green?​

Answer 1

Answer:

probablity of getting green masks is 2/5

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Answer 2

$Given \: Number \:of \:red \:masks = 6 \:and$

$Number \:of \: green \: masks = 5$

$Number \: of \: total \: possible \: outcomes$

$= 6 + 5$

$= 11 \: --(1)$

$number \:of \: favourable \: outcomes$

$= number \:of \:green \: masks$

$= 5$

$Probability \:of \: getting \:green \: masks$

$= \frac{5}{11} + \frac{4}{10}$

$= \frac{5}{11} + \frac{2}{5}$

$= \frac{25+22}{55}$

$= \frac{47}{55}$

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