Answer:
ways.
Step-by-step explanation:
is the number of ways in which 
distinct objects are selected from a pile of 
distinct objects.
In our question,there are a total of 
people.
So,
.
Given that three are selected at random.
So,
.
So,the answer is ways.
Answer:
B
Step-by-step explanation:
R = A / tetha
70° × pi/180 = radian
radian = 1.222 rad
3 = A / 1.222
Arc = 3.7 meter
i am a mathematics teacher. if anything to ask please pm me
Let R and B be the number of red and blue marbles respectively.
Then,
R+B = 36
R:B = 5:4
Therefore,
Ratio of red marbles = 5/9
Ratio of blue marbles = 4/9
This means,
R = 5/9*36 = 20 marbles
B = 4/9*36 = 16 marbles
If one blue marble is removed from the bag, the new B= 16-1 = 15 blue marbles and the new total of marbles in the bag = 36-1 = 35 marbles.
The new ratios are
R = 20/35 =4/7
B = 15/35 = 3/7
That is, R:B = 4:3
The reasoning of the student is wrong. When a marble is removed, both the number of blue marbles changes as well as the total of the marbles in the bag. In other words, both the values in the ratio reduce by 1.
area of triangle = 1/2bh
area = 1/2(120)(252) = 15120 in²
answer: C
