There are 8 marbles in a bag, all of different colors. In how many orders can 4 marbles be chosen? In other words, what is the number of permutations of picking 4 marbles from the bag?
A
1680
B
70
С
40320

I got 70

Combination=n!/((n-r)!r!)

=8!/((8-4)!*4!)

=8*7*6*5*4!/(4!*4!)

=8*7*6*5/(4*3*2)

=70 ways

2.

according to newton’s cannonball model, what happens if the cannonball's velocity is enough to overpower the pull of earth’s gravitystep-by-step explanation:

1,918

step-by-step explanation: