COMEDK2013MathematicsMathematical Reasoning
In the group (1,2,3,4,5,6) under multiplication 7,2⁻¹ 4 is equal to
Options
- A1
- B4
- C2
- D3
Correct answer
C. 2
Step-by-step solution
We have, aligned & & 2 4 &=1( 7) Hence, & 2⁻¹ &=4( 7) Now, & 2⁻¹ 4 &=4 4=16 Now, & 16 &=(2 7)+2 & 16 &=2( 7) & 2⁻¹ 4 &=2( 7) aligned