3^10=3^8*3²
3^8*3²*5^8=(3*5)^8 *3²=15^8*9
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15^9=15^8*15 15^8*15>15^8*9⇒3^10*5^8<15^9
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3^10=3^8*3²
3^8*3²*5^8=(3*5)^8 *3²=15^8*9
________
15^9=15^8*15 15^8*15>15^8*9⇒3^10*5^8<15^9
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