It would be 75% chance of him getting 2 black socks
Geometric sequence

r=common ratio
a1=first term
find r
a1=8
a6=-8192


divide both sides by 8

take 5th root of both sides
-4=r
sub



Answer:
Part A speed=96*2=192km/h
Step-by-step explanation:
Two parts, parts A and part B
Part A=200% more than B
Let part B=x
Part A=200 more than B
=2x
Speed ratio=2:1
Average speed of train=64km/h
Let Part A speed=2x
Part B speed=x
A:B=2:1
Total ratio =3
Speed in the part A can be calculated thus:
Totatl speed= ratio of speed in part A / total ratio
64=2x/3
192=2x
x=96km/h
Part A speed=96*2=192km/h
The second choice is the answer