1a)
use modular arithmetic and congruence to find the last digit of 4362^4362.
1b)
find all solutions to the following linear congruences. justify how many solutions exist.
(a) 2x ≅ 7 (mod 15)
(b) 3x ≅ 6 (mod 15)
(c) 5x ≅1 (mod 15)

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