Odd One Out: placement practice questions

Solution

61, 53, 17 are prime numbers.

81 is not prime (3 × 27).

Solution

16, 36, 64 are perfect squares.

288 is not a perfect square.

Solution

In GJM, NQT, PSV, each letter is 3 places after the previous one.

In NQU the last gap is 4, so it is the odd one.

Solution

The others are wild cats; cow is a domestic animal.

Solution

29, 19, 11 are prime numbers.

51 is not prime (3 × 17).

Solution

169, 324, 361 are perfect squares.

322 is not a perfect square.

Solution

In MOQ, HJL, KMO, each letter is 2 places after the previous one.

In TVY the last gap is 3, so it is the odd one.

Solution

The others are planets; the Moon is a satellite.

Solution

53, 37, 29 are prime numbers.

49 is not prime (7 × 7).

Solution

25, 169, 196 are perfect squares.

325 is not a perfect square.

Solution

In OQS, SUW, JLN, each letter is 2 places after the previous one.

In CEH the last gap is 3, so it is the odd one.

Solution

The others are organs; the femur is a bone.

Solution

41, 53, 31 are prime numbers.

21 is not prime (3 × 7).

Solution

16, 289, 144 are perfect squares.

103 is not a perfect square.

Solution

The others are outdoor field games.

Solution

73, 79, 47 are prime numbers.

33 is not prime (3 × 11).

Solution

361, 289, 25 are perfect squares.

290 is not a perfect square.

Solution

The others are rivers; Everest is a mountain.

Solution

11, 19, 23 are prime numbers.

33 is not prime (3 × 11).

Solution

36, 144, 16 are perfect squares.

171 is not a perfect square.

Solution

The others are cities; India is a country.

Solution

71, 37, 59 are prime numbers.

63 is not prime (3 × 21).

Solution

49, 16, 36 are perfect squares.

22 is not a perfect square.

Solution

In GKO, HLP, EIM, each letter is 4 places after the previous one.

In LPU the last gap is 5, so it is the odd one.

Solution

The others measure length; kilogram measures mass.

Solution

71, 41, 31 are prime numbers.

81 is not prime (3 × 27).

Solution

25, 81, 289 are perfect squares.

146 is not a perfect square.

Solution

The others are flowers; neem is a tree.

Solution

53, 29, 59 are prime numbers.

51 is not prime (3 × 17).

Solution

100, 144, 36 are perfect squares.

321 is not a perfect square.