C r = (n!)/(r!(n-r)!)
9 C 3 = (9!)/(3!*(9-3)!)
9 C 3 = (9!)/(3!*6!)
9 C 3 = (9*8*7*6!)/(3!*6!)
9 C 3 = (9*8*7)/(3!)
9 C 3 = (9*8*7)/(3*2*1)
9 C 3 = (504)/(6) 9 C 3 = 84
Answer:
1,100 / 8
Step-by-step explanation:
Answer: 91 students ride the bus
For this problem, you can set up a proportion where:
w = those who walk to school
r = those who ride the bus to school
Then include the ratio (1:7) as a fraction (1/7) and the value that is known (13).
Cross multiply (create an "x").
Answer:
The complete length is 115 cm.
Step-by-step explanation:
Given:
If 20%of a length is 23 cm.
Now, to find the complete length.
Let, the complete length be .
So, according to question:
20% of = 23 cm
Dividing both sides by 0.20 we get :
Therefore, the complete length is 115 cm.
Answer:
it is C
Step-by-step explanation:
8-3=5
5-3=2
2-3=-1
<u>-1-3=-4</u>