What is the smallest number that leaves a remainder of 2 when divided by 3, 4,…

2025

What is the smallest number that leaves a remainder of 2 when divided by 3, 4, 5, and 6?

  1. A.

    62

  2. B.

    56

  3. C.

    128

  4. D.

    32

Attempted by 67 students.

Show answer & explanation

Correct answer: A

Key idea: the number must be 2 more than a number divisible by 3, 4, 5, and 6.

  1. Rewrite the condition as n ≡ 2 (mod 3, 4, 5, 6), so n - 2 must be a common multiple of 3, 4, 5, and 6.

  2. Compute the least common multiple: lcm(3, 4, 5, 6). Use prime powers: 4 contributes 2^2, 3 contributes 3, and 5 contributes 5. So lcm = 2^2 × 3 × 5 = 60.

  3. The smallest number of the required form is 2 more than the least common multiple: 60 + 2 = 62.

Check: 62 mod 3 = 2, 62 mod 4 = 2, 62 mod 5 = 2, 62 mod 6 = 2, so 62 satisfies all conditions.

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