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- SECTION 3.7
- 8.
- 1=89*144-55*233
- 89
- 10.
- If n>1 then sa will not be congruent to l and m. Because of this, it will not be the modular inverse.
- 12.
- X 12(mod 17)
- 28a.
- 3^2 mod5 * (3^4)^75 mod5 = 3^2 mod5 * 1 = 9 mod5 = 4
- 3^2 mod7 * (3^6)^50 mod7 = 3^2 mod7 *1 = 9 mod7 = 2
- 3^2 mod11 * (3^10)^30 mod11 = 3^2 mod11 * 1 = 9 mod11 = 9
- 32.
- 1729 = 7*13*19
- If gcd(b, 1729) = 1, then gcd(b, 7) = gcd(b, 13) = gcd(b, 19) = 1.
- Using FLT, b6 1 (mod 7), b12 1 (mod 13) , and b18 1 (mod 19)
- b1728 (b6)288 1 (mod 7)
- b1728 (b12)144 1 (mod 13)
- b1728 (b18)96 1 (mod 19)
- By the CRT, it follows that b1728 1 (mod 1729)
- 36.
- d. 22
- h. 19
- 48.
- 17*356 – 24*252 = 4
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