●●● ●●●● ●●●●● ●●●● ●●0●● Outline ●●●● ●●●● ● Combinatorics(组合) Basic Counting Techniques Recurrence relations Binomial coefficients ● Number Theory Prime number ° Congruences ● Fermat' s Theorem o Euler's Theorem2 Outline ⚫ Combinatorics (组合) ⚫ Basic Counting Techniques ⚫ Recurrence Relations ⚫ Binomial Coefficients ⚫ Number Theory ⚫ Prime Number ⚫ Congruences ⚫ Fermat’s Theorem ⚫ Euler’s Theorem