GRE Exam Numerical Ability Probability

Certain bowl contains 5 yellow marbles and 3 green marbles only. One by one, every marble is drawn at random and without replacement. What is the probability that the seventh marble drawn is NOT green?

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GRE Other Question

If n is a non-negative integer and the remainder when 3^n is divided by 4 is a multiple of 3, then which of the following must be true?
I. n^2 divided by 4 yields the reminder of 1
II. (-2)^n is less than 0
III. n is a prime number A baseball is thrown up in the air from an initial height of 6 feet. Its height above the ground (in feet) t seconds after being thrown is given by the function h(t)=-16t^2+46t+6. How long will it take (in seconds) for the baseball to hit the ground?
A) 2 seconds B) 5/2 seconds c) 3 seconds D) 4 seconds