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osanseviero
Group Title
A person has 5 coins of different values. ¿How many different additions can I make?
 9 months ago
 9 months ago
osanseviero Group Title
A person has 5 coins of different values. ¿How many different additions can I make?
 9 months ago
 9 months ago

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ranga Group TitleBest ResponseYou've already chosen the best response.1
Is the question how many different additions can you make or how many different changes can you make with 5 coins?
 9 months ago

osanseviero Group TitleBest ResponseYou've already chosen the best response.0
I saw 31 as a result in some website, but I would like someone to explain how to solve this
 9 months ago

ranga Group TitleBest ResponseYou've already chosen the best response.1
To do additions you have to have at least 2 coins. You can select 2 coins in 5C2 ways. With three coin additions: 5C3 ways With four coin additions: 5C4 ways With five coin additions: 5C5 ways Add them all up.
 9 months ago

ranga Group TitleBest ResponseYou've already chosen the best response.1
But if you count the single coins itself (no additions) then 5C1 ways. So you add them all and you get 31. So when they say "sums" they don't mean additions but how many different changes can you make with 5 coins.
 9 months ago

osanseviero Group TitleBest ResponseYou've already chosen the best response.0
Oh...so it is 26, but if you can use the coins by themselves, you add 5. Thanks :D
 9 months ago

ranga Group TitleBest ResponseYou've already chosen the best response.1
yes. you are welcome.
 9 months ago
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