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Troyanec [42]
3 years ago
7

A jar contains 18 gold coins, 36 rose gold coins, 9 silver coins, and 27 copper coins. What is the probability of randomly selec

ting a copper coin from the jar?
a.2/9
b.3/10
c.5/12
d.1/2
Mathematics
2 answers:
Amiraneli [1.4K]3 years ago
6 0

Answer: B 3/10

When you add all the coins together, you get a sum of 90. To find the probability of the copper coin, you get 27/90. once simplified you get the answer 3/10.

hope this helps :)

galben [10]3 years ago
5 0

Answer:

3/10

Step-by-step explanation:

Take all of the coins

add them up

take 27/90 and simplify

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Using the binomial theorem , obtain the expansion of :
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see explanation

Step-by-step explanation:

Expand both factors and collect like term

Using Pascal' triangle with n = 6 to obtain the coefficients

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Increasing powers of 3x from (3x)^{0} to (3x)^{6}

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--------------------------------------------------------------------------------------

(1-3x)^{6}

= 1.1^{6}(-3x)^{0} + 6.1^{5}(-3x)^{1} + 15.1^{4}(-3x)^{2} + 20.1^{3}(-3x)^{3} + 15.1²(-3x)^{4} + 6.1^{1}(-3x)^{5} + 1.1^{0}(-3x)^{6}

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----------------------------------------------------------------------------------

Collecting like terms from both expressions

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= 2 + 270x² + 2430x^{4} + 1458x^{6}

----------------------------------------------------

(2)

Using Pascal's triangle with n = 5

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