 Lv 1139 points

# Na-Kyung

• ### Marbles without replacement question?

If I have 2 blue marbles, 3 red marbles, and 5 yellow marbles, what is the probabilty of selecting 2 red marbles and 3 yellow marbles if I draw 5 times without replacement?

Is there a clear-cut formula for this scenario where there is no replacement?

If I have 2 blue marbles, 3 red marbles, and 5 yellow marbles, what is the probabilty of selecting 2 red marbles and 3 yellow marbles if I draw 5 times with replacement?

• I know that I have to use combinations of some kind but the formula for combinations does not work for this scenario?

• • ### Really confused with this maths question?

• This question was on the actual 2013 ACT, so the answer cannot be wrong, but I’m so confused. The answer says it’s K.

I tried with the case where m = 2 (like y=2x + 1) and n = 3 (like y=x^2+x+1) and when I multiplied the two functions together, I got y=2x^3+3x^2+3x+1. So a total of 4 terms. But according to K, m*n, so there was to be 6 terms in the multiplied function, not 4??

• I have no idea why the answer is A. I can’t seem to find any evidence in the passage that supports this answer... Could anyone help please?

Question:

Assume that the gas giant planets and the non-gas-giant planets (terrestrial planets) in another solar system in our galaxy have spatial and size relationships the same as those of the gas-giant planets and the terrestrial planets in our solar system. Given this assumption, in the other solar system, an existing gas giant planet would most likely be:A) located at a greater distance from the star than would any of the terrestrial planets.B) located at a lesser distance from the star than would any of the terrestrial planets.C) the same diameter as the largest terrestrial planet.D) a lesser diameter than any of the terrestrial planets.

• I’m not understanding how to work with the equation.. No idea here..

• I’m comfused with why the answer is C? I thought because side b>a>c, BC > AC and therefore E? I thought the biggest angle corresponds with the biggest side and the smallest angle corresponds with the smallest side?

I’m confused with how to work out “a” in this equation..

a + root a =132

• 