Suppose that in a DNA string the probability of getting an A is 0.29, that of getting a C is 0.23, that of getting a G is 0.27 and that of getting a...

Suppose that in a DNA string the probability of getting an A is 0.29, that of getting a C is 0.23, that of getting a G is 0.27 and that of getting a T is 0.21 in each place. What is the probability that in a string of length 30 there are 8 T's, given that the number of A's and G's are equal, and that the number of C's and T's are equal. Assume the independence model for the genome