How many different committees can be formed from 8 teachers and 31 students if the committee consists of 3 teachers and 3 stude
2 answers:
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We can calculate it by PVOA table.
PVOA means present value of an ordinary annuity.
PMT = $350
PMT means recurring payment.
time = 5 years and interest rate is 4%
So n = 5 and i = 4%
So we can calculate PVOA as
PVOA = PMT times (PVOA factor for n = 5 and i = 4%)
(PVOA factor PVOA table)
So present value is $1558.2
PVOA means present value of an ordinary annuity.
PMT = $350
PMT means recurring payment.
time = 5 years and interest rate is 4%
So n = 5 and i = 4%
So we can calculate PVOA as
PVOA = PMT times (PVOA factor for n = 5 and i = 4%)
So present value is $1558.2
Answer:
students liked apples, but not bananas and guavas at the same time. (
students liked apples and liked neither bananas nor guavas.)
students liked bananas only.
students liked apples or bananas but not guavas.
students liked bananas or guavas or apples, (That is the number of students that liked one or more of the three fruits.)
students liked apples and guavas but not bananas.
Step-by-step explanation:
Start by drawing a Venn Diagram. (Refer to the first attachment.)
- The outermost rectangle denotes the set of all
students that were surveyed.
- The top-left circle denotes the set of surveyed students that liked apples.
- The top-right circle denotes the set of surveyed students that liked bananas.
- The other circle denotes the set of surveyed students that liked guavas.
Using information from the question, fill in the number of students in each section.
Start with intersection of all three circles denotes the set of surveyed students that liked all three fruits.
The question states that there are students in this set. Besides, this set isn't a superset of any other set. Therefore, write the number
in the corresponding place without doing any calculation.
Continue with the intersection of students that liked two fruits only. For example, the question states that surveyed students liked apple and bananas. However, that
students also include the
surveyed students that liked all three fruits (apple, banana, and guava.) Therefore, only
surveyed students liked apple and banana only (but not guava.)
Similarly:
surveyed students liked bananas and guavas only.
surveyed students liked apples and guavas only.
The question states that surveyed students liked guavas. However, among that
students:
of them also liked banana but not apples (bananas and guavas only.)
of them also liked apples but not bananas (apples and guavas only.)
of them also liked apples and bananas (all three fruits.)
Therefore, only surveyed students liked guava but neither apple nor banana (guava only.)
Similarly:
of the surveyed students liked apples but neither guava nor banana (apple only.)
of the surveyed students liked bananas but neither apple nor guava (bananas only.)
Among the surveyed students,
of them liked none of the three fruits.
Refer to the second diagram attached for the Venn Diagram with the corresponding numbers.
Students that liked apples but not bananas and guavas at the same time include:
- Students that liked apples only.
- Students that liked apples and bananas, but not guavas (apple and banana only.)
- Students that liked apple and guavas, but not bananas (apple and guava only.)
These three subsets include surveyed students.
It was previously found that students liked bananas only.
Students that liked apples or bananas but not guavas include:
- Students that liked apples only.
- Students that liked bananas only.
- Students that liked apples and bananas, but not guavas (apple and banana only.)
That include surveyed students.
Among these surveyed students, of them liked at least one of the three fruits.
It was previously found that among these surveyed students, of them liked apples and guavas only. That gives the number of students that liked apples and guavas, but not bananas.
