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Determinați ultima cifră a numerelor:
[tex]2 + {2}^{2} + {2}^{3} + ... + {2}^{45} [/tex]
[tex]7 + {7}^{2} + {7}^{3} + ... + {7}^{43} [/tex]
[tex] {3}^{0} + 3 {3}^{1} {3}^{2} + {3}^{3} + ... {3}^{42} [/tex]
[tex]8 + {8}^{2} + {8}^{3} + ... {8}^{88} [/tex]