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Topic review

by Archis on Thu Mar 26, 2009 4:17 am

No solutions? The perfect opportunity to drone on about the importance of this problem solving topic:

Complementary probability is key here. Denoted as so:


Where, P(A) is defined as a certain probability, the complement is the probability that it will not happen.

The solution to this problem focuses on the fact that (where 1/4 is the probability of Acid Rain and P(A^C) is the probability of no acid rain):


The solution asks for the probability that all 5 days have no acid rain or:

Zillo's picnic

by Archis on Wed Dec 24, 2008 12:23 am

Here's a problem I made to spark the Probability Forum:

Zillian and Zillo live on the planet Zarquon Z. Due to atmospheric pollution, Zarquon Z experiences acidic rainfall with 1/4 of a chance on a SINGLE day. Zillo is planning a picnic for the next five days and hopes for clear skies in that time. What is the probability of NO acidic rainfall the next FIVE days on Zarquon Z?