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CDS 2024 · PYQ · Number System / Divisibility · medium

Consider the following statements: 1. If (3m³ + 2m² + 5m + n)/m is not an integer, where m and n are integers, then n is not divisible by m. 2. 5(8^m) + 2^(3m) is divisible by 48 for all whole numbers m. Which of the statements given above is/are correct ?

  1. A.1 only✓ Correct
  2. B.2 only
  3. C.Both 1 and 2
  4. D.Neither 1 nor 2

Explanation

Statement 1: (3m³ + 2m² + 5m + n)/m = 3m² + 2m + 5 + n/m. The first three terms are integers. So the whole expression is integer iff n/m is integer, i.e., m divides n. Contrapositive: if expression is not integer, then m does not divide n. So statement 1 is correct. Statement 2: 5(8^m) + 2^(3m) = 5·8^m + 8^m = 6·8^m. For m = 0: 6·1 = 6, not divisible by 48. So statement 2 is false. Only statement 1 is correct.
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