You are given a bag of coins with varying biases what is the probability of getting 100 heads (1/4) ^100

With the given information I have a chance at getting 100 heads. So I'm going to say that the probability of getting that 100 would be a fifty fifty chance. Not knowing exactly what the biases are I can't conclude a better answer. However if the circumstances are that the issues is wind or simply location then chances could be lower than fifty percent.