Question 10

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Jambmaths question: 

Θ

K

L

M

K

L

M

K

L

M

K

L

M

K

L

M

The identity element with respect to the multiplication shown in the table above is

Option A: 

O

Option B: 

M

Option C: 

L

Option D: 

 K

Jamb Maths Solution: 

For identity to hold,$\begin{align}  & p\otimes e=p\text{ or }e\otimes p=p \\ & \text{so } \\ & M\otimes K=K \\ & M\otimes L=L \\ & M\otimes M=M \\ & \text{So M is the identity element} \\\end{align}$

Jamb Maths Topic: 
Year of Exam: