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(Solved): 1. when p is prime [[p-1],[n]]=(-1)n, 1<=n<=p-1. prove please. 2. F ...



1. \( \left(\begin{array}{c}p-1 \\ n\end{array}\right) \equiv(-1)^{n} \quad(\bmod p), 1 \leq n \leq p-1 \)??????? when p is prime [[p-1],[n]]=(-1)n, 1<=n<=p-1. prove please.

2. Find the solution of the following system of congruences.

(1) x ? 2 (mod 9)
x ? 11 (mod 15)

(2) x ? 2 (mod 9)
x ? 11 (mod 15)
x ? 16 (mod 25)

3. Find the solution of the following quadratic congruence

(1) x2 + 7x + 10 ? 0 (mod 15)

(2) x2 + 10x + 21 ? 0 (mod 17 · 23)

(3) x2 + 5x ? 0 (mod 6)

(4) x2 + 7x ? 0 (mod 8)



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