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GATE 2024 MA – Question 40

Algebra · Groups · 2 marks · Multiple choice

I: Some proper subgroup G of (ℚ,+) has finite quotient ℚ/G. II: Some subgroup G has quotient isomorphic to (ℤ,+). Choose truth values.

  1. Both I and II true
  2. I true, II false
  3. I false, II true
  4. Both false

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Correct answer: (D) Both false

Explanation

The additive rationals are divisible: every element has an n-th additive root for every positive n. Every quotient remains divisible. A finite divisible group must be trivial, contradicting properness in I. ℤ is not divisible, so it cannot be such a quotient either. **Both false, D**.

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