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Find the remainder of 6^1000 when divided by 5.

Question

Find the remainder of 6^1000 when divided by 5.

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Solution

Para encontrar el residuo de 610006^{1000} al dividirlo por 5, podemos usar el pequeño teorema de Fermat. Este teorema dice que si pp es un número primo y aa es un entero que no es divisible por pp, entonces ap11(modp)a^{p-1} \equiv 1 \pmod{p}.

En este caso, p=5p = 5 y a=6a = 6. Primero, notamos que 6 es congruente con 1 módulo 5, es decir:

61(mod5) 6 \equiv 1 \pmod{5}

Por lo tanto, podemos reescribir 610006^{1000} como:

6100011000(mod5) 6^{1000} \equiv 1^{1000} \pmod{5}

Dado que cualquier número elevado a cualquier potencia sigue siendo el mismo número, tenemos:

11000=1 1^{1000} = 1

Por lo tanto:

610001(mod5) 6^{1000} \equiv 1 \pmod{5}

El residuo de 610006^{1000} al dividirlo por 5 es 1.

This problem has been solved

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