Suppose there are 21 students in your class. If the teacher draws 2 names at random, what is the probability that you and your best friend will be chosen?
2/21
1/20
1/105
2/10
8 answers
A specific two names out of 21? What do you think?
Mine had different possible answers, mine was 1/210. I'm not sure how it got there but that's what it was. Sorry i prob didn't help much.
I ran into the exact same problem. PsyDAG was wrong because by taking out either you or your friend. That means there are less people, changing the possibility for the one left behind. The answer is 2/10 i think.
its 1/210
Its 1 1/210 I just answered it on switched on schoolhouse, Hope this helps!!! (:
1/20 duh
2 students will be called out of 21 students.
this means that you will take 1 random student and subtract 1 from 21 because you can't get 2/20 then 3 people would have been chosen out of 21. Once you have the number 20 make a fraction with your best friend. 1/20 is what you guys should have got. If not you probably multiplied the denominators 20 and 21 and got 420 or if your dumb you got 210.
2 students will be called out of 21 students.
this means that you will take 1 random student and subtract 1 from 21 because you can't get 2/20 then 3 people would have been chosen out of 21. Once you have the number 20 make a fraction with your best friend. 1/20 is what you guys should have got. If not you probably multiplied the denominators 20 and 21 and got 420 or if your dumb you got 210.
P.s.
Remember your best friend is one person!
1
_____
20
Remember your best friend is one person!
1
_____
20
1/210
1 answer