1.
An urn contains different colored marbles. The probability of drawing two green marbles from the urn without replacement is 320 , and the probability of drawing one green marble is 25 .
What is the probability of drawing a second green marble, given that the first marble is green?
1/5
3/8
3/50
1/2
2.
Let cos(−θ)=4/5
and tanθ>0 .
What is the value of sin(−θ)
?
4/3
4/5
−3/5
−4/5
3.
Let tan(x)=2/5
.
What is the value of tan(π+x)
?
5/2
−2/5
2/5
−5/2
