Thread: Science Quiz - win SciHD creds / Seedbox

probability of one more ball correct = 4 out of 43
next ball correct = 3 out of 42
and so on...

Probability
= (4/43) * (3/42) * (2/41) * (1/40)
= 1/123410

Originally Posted by buzz

I'm posting first so I don't kill-steal this time xD

Ok, so disregard the 1st 2 since they're already in the bag. Just -2 from total number of possibilities since this is without replacement.
We're trying to find probability for getting the next 4/4 from 43 options w/o replace.

So:
Probability of ball 3 correct = 1/43
-AND-
Probability of ball 4 correct = 1/42
-AND-
Probability of ball 5 correct = 1/41
-AND-
Probability of ball 6 correct = 1/40

So (1/43)*(1/42)*(1/41)*(1/40)
= 1/2961840 = 3.376 *10^-7
= 0.00003376% chance -or-
= 1 in 2961840 chance

Right?

Buzz, I think you got it right again.

Originally Posted by MrCoolBoy

probability of one more ball correct = 4 out of 43
next ball correct = 3 out of 42
and so on...

Probability
= (4/43) * (3/42) * (2/41) * (1/40)
= 1/123410

Correct! Nice work MCB.

I'll post the next question after I take my boys to school.

---------- Post added at 09:00 AM ---------- Previous post was at 07:03 AM ----------

Check the first post of this thread to check out the leaderboard!

Question #9 -

Everyone's favorite subject, botany!

Identify these plant species (common name or scientific name):
a)
b)
c)
d)
e)

a) Mimosa pudica aka Sensitive Plant

b) Wonder what it is. :s

c) Castilleja miniata aka Giant Red Indian Paintbrush

d) Aloe vera

e) Dionaea muscipula aka Venus Flytrap

Don't know the (c) one.

Hint #1 -
b) Here's another pic of the same plant:

c) Is a type of wildflower

Then C is maybe a Indian Paintbrush or Red Paintbrush
This b) thing is a real puzzle

b) is native to North America, so I can see why some of you are having trouble. I'd suggest asking someone from that part of the world.

is b) poison ivy ?

Originally Posted by Cheesecake

is b) poison ivy ?

Yes! This one was difficult overall, so I'm going to award one 'win' to each of you: Cheesecake (for poison ivy), Dejvi (for indian paintbrush), and Smack for the rest (can't believe you got the mimosa!).

Question 10: Subject: Astronomy

Identify the following image: