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NECO 2024 · Paper 1 · Q12

Evaluate 15⊗2615 \otimes 26 in modulo 5.

Worked solution (try it first)
  1. Reduce each number first: 15 is a multiple of 5, so 15≡0(mod5)15 \equiv 0 \pmod 5, and 26≡1(mod5)26 \equiv 1 \pmod 5.
  2. Multiply the remainders: 0×1=00 \times 1 = 0.
  3. So 15⊗26≡0(mod5)15 \otimes 26 \equiv 0 \pmod 5, option A.

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