math guys answer this question
 

There are n sweets in a bag. Six of the sweets are orange. The rest of the sweets are yellow.

Hannah takes a sweet from the bag. She eats the sweet. Hannah then takes at random another sweet from the bag. She eats the sweet.

The probability that Hannah eats two orange sweets is 1/3. Show that n²-n-90=0

i cunt do maffs.... :(

Still can't pass your GED test?

me too :1orglaugh

I retired from Maths

wow it must suck to be so bitter about life... :2 cents:

6/n x 5/n–1
=6/n x 5/n–1 = 1/3


(6x5)/n(n-1) = 30/(n2 – n) = 1/3

Or 90/(n2 – n) = 1

So (n2 – n) = 90

n2 – n – 90 = 0

I'll start you off ... maybe:

1/3 = 6/n x 5/(n-1)
1/3 = 30 / n(n-1)

I'm not even sure if I'm on the right track ...

head hurts, I'm out :2 cents:

the answer is 10

42 is the answer of everything.

n is 10 as 10 x 10 = 100 - 10 = 90 - 90 = 0

So who ..whom fucking here