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computer001 (1847)

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Olaaa!! Perrrfect answer. 297  [478 rates]

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(43)^211
(43)^4=1mod8
so (43)^208=1mod8
(43)^3=3mod 8
so (43)^211=3mod8
(43)^100=1mod125
so (43)^200=1mod125
(43)^11=mod125
(43)^211=-43mod125
so 8k+3=82mod125
so 8k=79mod125
so k=125t+88
so 8k+3=1000t+707
so last 3 dig are 707



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