Find the dissimilar pair of numbers.

The logic followed here is : Value of both the pair of fractions are equal.

So,

• Option - (1) : 

 →  And,  →  ⇒ Pair of fractions are equal.

• Option - (2) : 

 →  And,  →  ⇒ Pair of fractions are not equal.

• Option - (3) : 

 →  And,  →  ⇒ Pair of fractions are equal.

• Option - (4) : 

 →  And,  →  ⇒ Pair of fractions are equal.

Thus, out of all the options "" is the dissimilar pair of numbers.

Hence, “Option - (2)” is the correct answer.