7^2x4 = n^8
7^8 = n^8
n = 7
Answer:
(a) 120 choices
(b) 110 choices
Step-by-step explanation:
The number of ways in which we can select k element from a group n elements is given by:

So, the number of ways in which a student can select the 7 questions from the 10 questions is calculated as:

Then each student have 120 possible choices.
On the other hand, if a student must answer at least 3 of the first 5 questions, we have the following cases:
1. A student select 3 questions from the first 5 questions and 4 questions from the last 5 questions. It means that the number of choices is given by:

2. A student select 4 questions from the first 5 questions and 3 questions from the last 5 questions. It means that the number of choices is given by:

3. A student select 5 questions from the first 5 questions and 2 questions from the last 5 questions. It means that the number of choices is given by:

So, if a student must answer at least 3 of the first 5 questions, he/she have 110 choices. It is calculated as:
50 + 50 + 10 = 110
Answer:
minus
Step-by-step explanation:
it means minus maybe think that what it means
Answer:
The answer is B.
Step-by-step explanation:
3 times 3 is 9. 2 times -6 is -12. 9 + -12 is -3.
9 times 3 is 27. 4 times -6 is -24. 27 + -24 is 3.
Answer:
5 1/3 x 2 3/4= 3/4 5 x 2 = 10
Step-by-step explanation:
Multiply fractions 1/3 x 3/4= 3/4