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COMEDK2012MathematicsMathematical Reasoning

In the group G= 1,5,7,11 under ₁₂ the value of 7 ₁₂ 1 l ⁻¹ is equal to

Options

  1. A5
  2. B7
  3. C11
  4. D1

Correct answer

A. 5

Step-by-step solution

Clearly, 11⁻¹=1 1 [ 11 ₁₂ 11=1 ] So, 7 ₁₂ 11⁻¹=7 ₁₂ 11=5

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