Prs
Forum > Quidditchplanen > Rollspel > Prs
| Användare | Inlägg |
|---|---|
|
Fairy Tale
Elev 
|
"Okay", sa jag
30 okt, 2014 10:41 |
Borttagen
|
Jag suckade
30 okt, 2014 10:42 |
|
Fairy Tale
Elev
|
"On a party, everyone shook hands with eachother, there were 66 handshakes, how many were at the party?", sa jag
30 okt, 2014 10:45 |
|
Borttagen
|
"33,sa jag
30 okt, 2014 10:46 |
|
Fairy Tale
Elev
|
"Wrong", sa jag
30 okt, 2014 10:47 |
|
Borttagen
|
"I dont know,sa jag
30 okt, 2014 10:48 |
|
Fairy Tale
Elev
|
"12", sa jag "want to know why?"
30 okt, 2014 10:50 |
|
Borttagen
|
"Yes,sa jag
30 okt, 2014 10:51 |
|
Fairy Tale
Elev
|
"In general, with n+1 people, the number of handshakes is the sum of the first n consecutive numbres: 1+2+3...+n. Since this sum is (n+1)/2, we need to solve the equation n(n+1)/2=66. This is the quadratic equation n2+n-132=0. Solving for n, we obtain 11 as the answer and deduce that there were 12 people at the party", sa jag
30 okt, 2014 10:58 |
|
Borttagen
|
"Uh...what?,sa jag oförstående
30 okt, 2014 10:59 |
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