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.