I think c or A is the answer
Answer:
21
Step-by-step explanation:
In order to form a chord you need to:
- Select one point. You have 7 choices
- Select a another point. You have just 6 choices because you have to dicard the point alredy chosen
- Connect the two points with a chorde
Since we have 7 choices for the first point and 6 for the second one, one might think that there are a total of 7*6 = 42 choices.
However the correct answer is 21, because you have to take into the account that selecting the point A first and selecting the point B on second step is the same than selecting the point B first and then the point A, because the chord is the same.
Therefore we are counting each chord twice, and we have to divide the result by 2, obtaining 7*6 / 2 = 21.
You can also calculate the amount by using the combiatorial number. The total amount of possibilities to select k elements from a set of n, with n higher than or equal to k and both positive, without taking into account the order is the combinatorial number of n with k, given by
In this case, in order to form a chord we need to select 2 points of the seven we are given, ignoring order, thus the total amount of possibilities is
As we calculated before.
Answer:
Step-by-step explanation:
Cost of 4 oranges = $x
cost of 1 orange= x/4
Cost of 10 oranges = x/4*10 = $ 2.5x
Cost of a custard apple = $1.25
Cost of n custard apple = 1.25*n = 1.25n
Cost of 4 bananas = $3
Cost of a banana = 3/4 = $0.75
Cost of (3n +1) bananas = 0.75*(3n+1) = 0.75* 3n + 0.75*1 = 2.25n + 0.75
Cost of fruits = 2.5x + 1.25 n + 2.25n + 0.75
= 2.5x + 3.50n +0.75
Answer: i'm looking for the answer to this question too, srry for answering
Answer:
A.
D.
Step-by-step explanation: Trust me
Mark brainly