Answer:
3.27e11
Explanation:
[tex]\frac{15!}{2! 2!}[/tex]
15! = 15 * 14 * 13 * 12 * 11 * 10 * 9 * 8 * 7 * 6 * 5 * 4 * 3 * 2 * 1 = 1.31e12
If there are no letters with multiple occurences, the answer would be around 1.31e12. However, since we have 2 "a" and 2 "t", we need to divide by 2! and 2! to prevent double-counting some permutations.
