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Re: A bag contains 3 gold coins and 7 silver coins. The bag cont [#permalink]
1
Carcass wrote:
Do not get the first 3

??

I think first 3 is to consider the following thing

g=gold
s=silver

gss
ssg
sgs

Total of 3 ways.
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Re: A bag contains 3 gold coins and 7 silver coins. The bag cont [#permalink]
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We can solve using the combination. Pick 2 silver from 7 and 1 gold from 3. Divide this with total possible outcomes ( 10C3 )

( 7C2 * 3C1 ) / 10C3 = (21 * 3) / 120 = 21/40
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Re: A bag contains 3 gold coins and 7 silver coins. The bag cont [#permalink]
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