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Q

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[TEX]9^{2013} \equiv 9^{504} \pmod{21}[/TEX]
[TEX] 9^{504} \equiv 9^{126} \pmod{21}[/TEX]
[TEX] 9^{126 } \equiv 15^{14 }\pmod{21} [/TEX]
[TEX] 15^{14} \equiv 15 \pmod{21}[/TEX]
=> [TEX]9^{2013}[/TEX] chia[TEX] 21[/TEX] dư [TEX]15[/TEX]
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