How many different groups of 48 cars can be formed from 50 cars?
2
1,225
117,600

This is hard to evaluate, but it's equal to "50 things taken 2 at a time" so let's compute that as follows:  

(50)(49)/(1)(2) = 1225 answer

Step-by-step explanation:

c. (3,2,6) is the answer.

the 8 in 8,420 is in the thousands place so it's value is 8 thousand.

the 8 in 6,870 is in the hundreds place so it's value is 8 hundred.

divide 8000 by 800 to find the answer:

8000 / 800 = 10

the 8 in 8,420 is 10 times greater than the 8 in 6,870