Find the dissimilar term.

P49, T4, Z64, K9.

The logic followed here is: Square of the sum of the digits of the position value of the alphabet according to the English alphabetic series is equal to the numeric value of the pair.

• Option- (1) : T4

T - Position value = 20 → (2 + 0)² ⇒ 4

• Option- (2) : Z64

Z - Position value = 26 → (2 + 6)2 ⇒ 64

• Option- (3) : P49

P - Position value = 16 → (1 + 6)2 ⇒ 49

• Option- (4) : K9

K - Position value = 11 → (1 + 1)2 ⇒ 4, which is not equal to '9'.

Here, 'K9' is odd among the given options.

Hence, "Option - (4)" is the correct answer.