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The remainder when $$7^{84}$$ is divided by $$342$$ is :
0
1
49
341
$$7^3$$ = 343
$$7^{84}$$ = $$(7^3)^{28}$$ = $$343^{28}$$
$$343^{28}$$ mod 342 = $$1^{28}$$ mod 342 = 1
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