HELP!
2 answers:
Answer:
Number of ways of selecting two students is 15
Step-by-step explanation:
number of ways of selecting n out of r is given by
It is given that there are 6 seniors on student council.
2 students are selected for district meeting
So we have and
number of ways of selecting two students =
=
=
So we have number of ways of selecting two students is 15
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Answer:
Option 2 -
Step-by-step explanation:
Given : John rolls a six-sided number cube twice.
To find : What is the probability of getting an even number and then an odd number?
Solution :
When rolls a six-sided number cube twice
(1,1) (1,2) (1,3) (1,4) (1,5) (1,6)
(2,1) (2,2) (2,3) (2,4) (2,5) (2,6)
(3,1) (3,2) (3,3) (3,4) (3,5) (3,6)
(4,1) (4,2) (4,3) (4,4) (4,5) (4,6)
(5,1) (5,2) (5,3) (5,4) (5,5) (5,6)
(6,1) (6,2) (6,3) (6,4) (6,5) (6,6)
Now,
Favorable outcome of getting an even number and then an odd number:
(2,1) (2,3) (2,5) (4,1) (4,3) (4,5) (6,1) (6,3) (6,5)
So, Favorable outcome = 9
Total number of outcome = 36
Therefore, Option 2 is correct.