Find the odd one out: 21 69 81 83 All are multiple of 3 except 83.

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Question
Find the odd one out:
Options
A. 21
B. 69
C. 81
D. 83

Correct Answer

83

Explanation

All are multiple of 3 except 83.

Classification problems

Search Results

1. Find the odd one out:
Options
A. 369
B. 462
C. 761
D. 862

Discuss

Correct Answer: 761

Explanation:

761 is the only prime in the group.

2. Find the odd one out:
Options
A. 361
B. 484
C. 566
D. 529

Discuss

Correct Answer: 566

Explanation:

566 is the odd one out as the rest of the numbers are perfect squares.

3. Find the odd one out:
Options
A. 28
B. 65
C. 126
D. 215

Discuss

Correct Answer: 28

Explanation:

28 is the only number with all even digits.

4. Find the odd one out:
Options
A. 263
B. 111
C. 242
D. 551

Discuss

Correct Answer:

Explanation:

In all the numbers except 383, the middle digit is the product of the other two digits.

5. Find the odd one out:
Options
A. 2
B. 16
C. 56
D. 128

Discuss

Correct Answer: 56

Explanation:

Except 56 all can be expressed as power of 2.

6. Find the odd one out:
Options
A. 1236
B. 2346
C. 4566
D. 5686

Discuss

Correct Answer: 5686

Explanation:

The unit digit remains same, and the thousand place, hundredth place and tenth place changes and follow particular pattern except in 5686.

7. Find the odd one out:
Options
A. 11
B. 13
C. 15
D. 17

Discuss

Correct Answer: 15

Explanation:

All numbers are prime numbers except 15.

8. Find the odd one out:
Options
A. 17
B. 13
C. 23
D. 37

Discuss

Correct Answer: 23

Explanation:

All numbers are prime numbers but when we reverse the digits all except 23 remain prime numbers.

9. Find the odd one out:
Options
A. 126
B. 217
C. 345
D. 513

Discuss

Correct Answer: 345

Explanation:

All the numbers except 345 are one more than the cube of a certain number.

10. Find the odd one out:
Options
A. 143
B. 133
C. 131
D. 87

Discuss

Correct Answer: 131

Explanation:

131 is the odd one out as it is the only prime number.

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