If a > b
Then a^x > b^x, if x > 0
a = 3^{15}
b = 5^8
x = 50
As we can calculate that 3^{15} > 5^{8}
We can say that (3^{15})^{50} > (5^{8})^{50}
Thus, 3^{750} > 5^{400}
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oh great. Thanks a lot.