TRICKY f(n)

If n is an integer, f(n) = f(n – 1) – n, and f(4) = 10. What is the value of f(6)?

A is left with 5, B now has 15, 2/15 is the salt solution in B.

Now, as you put B into A, you are going to have an equation of,

((2/15)y)/(y+5)=.05

1.25y=3.75
y=3

for some reason, I read this problem wrong.. A is correct.

Answer is D. X^2 and Y^2 will always be positive regardless of the signs, so X/Y>0 at all times.

I would go with D, as it is the only one that does not strengthen the conclusion that SUV are more dangerous than cars.......Whats the OA?

Sentence in itself does not make sense......

hmm Shouldn't it be, 4C2/5C4?

Vamuri, can you present and explain a formula you used for how you were able to derive how the arrangements were calculated? For example, GGGG-arranged in 1 way, i understand the logic, but is there a formula?

Thanks