Odd One Out (SSC CPO 2019 Tier – 1)

In all the options all three numbers are made up of the same digits

But,

In (432 : 324 : 231) is different from others

Hence, "(432 : 324 : 231)" is the odd one.

Hence, "Fire" is odd from others.

But,

Incision means the action of making a surgical cut in skin or flesh.

Hence, "Incision" is odd one.

61, 109, and 73 are prime numbers.

But,

91 is not a prime number.

Hence, "91" is the odd one.

The pattern followed here is :

{1^st number × (1^st number + 1) = 2^nd number

(21 : 462) → {21 × (21 + 1)} ⇒ 21 × 22 = 462

(14 : 210) → {14 × (14 + 1)} ⇒ 14 × 15 = 210

(25 : 650) → {25 × (25+ 1)} ⇒ 25 × 26 = 650

But,

(7 : 50) → {7 × (7 + 1)} ⇒ 7 × 8 = 56 ≠ 50

Hence, "(7 : 50)" is the odd one.

But,

In (632 : 325 : 236), here 4 digits are used.

Hence, "(632 : 325 : 236)" is the odd one.

The pattern followed here is :

(1^st number × 6) = 2^nd number & (1^st number × 12) = 3^rd number

(17 : 102 : 204) → (17 × 6 = 102) & (17 × 12 = 204)

(12 : 72 : 144) → (12 × 6 = 72) & (12 × 12 = 144)

(26 : 156 : 312) → (26 × 6 = 156) & (26 × 12 = 312)

But,

(14 : 90 : 180) → (14 × 6 = 84 ≠ 90) & (14 × 12 = 168 ≠ 180)

Hence, "(14 : 90 : 180)" is the odd one.

The pattern followed here is :

{1^st letter + 2 = 2^nd letter}, {2^nd letter + 2 = 3^rd letter}, {3^rd letter + 2 = 4^th letter} & {4^th letter + 2 = 5^th letter}

EGIKM → (E + 2 = G), (G + 2 = I), (I + 2 = K) & (K + 2 = M)

BDFHJ → (B + 2 = D), (D + 2 = F), (F + 2 = H) & (H + 2 = J)

QSUWY → (Q + 2 = S), (S + 2 = U), (U + 2 = W) & (W + 2 = Y)

But,

NOQST → (N + 2 ≠ O), (O + 2 = Q), (Q + 2 = S) & (S + 2 = T)

Hence, "NOQST" is the odd one.

The pattern followed here is :

(1^st number ÷ 2)² = 2^nd number

(16 : 64) → (16 ÷ 2)² ⇒ 8² = 64

(34 : 289) → (34 ÷ 2)² ⇒ 17² = 289

(18 : 81) → (18 ÷ 2)² ⇒ 9² = 81

But,

(26 : 168) → (26 ÷ 2)² ⇒ 13² = 169 ≠ 168

Hence, "(26 : 168)" is the odd one.

But,

Petrol is a fuel.

Hence, "Fuel" is the odd one.