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Series, coding and analogies

Written by Bilal Siddiqui (Logical Reasoning)

22 Government jobs Mental ability questions with answers and explanations.

Printable worksheet with answer key

All questions with answers
  1. Find the next number: 2, 6, 12, 20, 30, ?

    • 1 36
    • 2 42
    • 3 44
    • 4 40
    Show answer

    Correct answer: 42

    The differences are 4, 6, 8, 10, so the next difference is 12 and 30 + 12 = 42.

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  2. Find the next number: 3, 6, 12, 24, ?

    • 1 48
    • 2 30
    • 3 42
    • 4 36
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    Correct answer: 48

    Each term is double the one before.

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  3. Find the odd one out: 16, 25, 36, 48, 64

    • 1 64
    • 2 25
    • 3 16
    • 4 48
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    Correct answer: 48

    All others are perfect squares.

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  4. Doctor is to hospital as teacher is to:

    • 1 Book
    • 2 Student
    • 3 Class
    • 4 School
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    Correct answer: School

    A doctor works in a hospital, and a teacher works in a school.

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  5. If CAT is coded as DBU, how is DOG coded?

    • 1 EPH
    • 2 DPH
    • 3 EOH
    • 4 FQI
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    Correct answer: EPH

    Each letter moves one place forward.

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  6. Find the next letter: A, C, F, J, ?

    • 1 O
    • 2 N
    • 3 M
    • 4 P
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    Correct answer: O

    The gaps are 2, 3, 4, so the next gap is 5, and J + 5 = O.

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  7. Which one is different: Tiger, Lion, Leopard, Horse?

    • 1 Leopard
    • 2 Lion
    • 3 Tiger
    • 4 Horse
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    Correct answer: Horse

    The first three are big cats, and the horse is not.

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  8. Find the next number: 1, 4, 9, 16, ?

    • 1 25
    • 2 36
    • 3 20
    • 4 24
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    Correct answer: 25

    These are squares: 1², 2², 3², 4², and the next is 5² = 25.

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  9. If 'pen' is called 'book', 'book' is called 'bag' and 'bag' is called 'desk', what do you write with?

    • 1 Bag
    • 2 Book
    • 3 Pen
    • 4 Desk
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    Correct answer: Book

    You write with a pen, and in this code a pen is called a book.

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  10. Complete: 5, 10, 20, 40, ?

    • 1 60
    • 2 100
    • 3 80
    • 4 50
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    Correct answer: 80

    Each number is double the one before.

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  11. Find the next number: 7, 14, 28, 56, ?

    • 1 84
    • 2 112
    • 3 70
    • 4 98
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    Correct answer: 112

    Each number is double the one before.

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  12. Find the next number: 100, 91, 82, 73, ?

    • 1 65
    • 2 60
    • 3 63
    • 4 64
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    Correct answer: 64

    Each term is 9 less than the one before.

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  13. Find the odd one out: 3, 5, 7, 9, 11

    • 1 3
    • 2 5
    • 3 9
    • 4 11
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    Correct answer: 9

    All the others are prime numbers.

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  14. Hand is to glove as foot is to:

    • 1 Sock
    • 2 Toe
    • 3 Leg
    • 4 Shoe
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    Correct answer: Sock

    A glove covers a hand, and a sock covers a foot.

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  15. If A = 1, B = 2, then the value of CAB is:

    • 1 321
    • 2 123
    • 3 312
    • 4 213
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    Correct answer: 312

    C is 3, A is 1 and B is 2.

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  16. If MONDAY is coded as NPOEBZ, SUNDAY is coded as:

    • 1 TVOEBZ
    • 2 RTMCZX
    • 3 TVNEBZ
    • 4 TVOFBZ
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    Correct answer: TVOEBZ

    Each letter moves one place forward.

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  17. Find the missing number: 2, 5, 10, 17, 26, ?

    • 1 36
    • 2 35
    • 3 39
    • 4 37
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    Correct answer: 37

    The terms are n² + 1: 1² + 1, 2² + 1, ... so 6² + 1 = 37.

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  18. Which word is different: Apple, Mango, Potato, Banana?

    • 1 Apple
    • 2 Potato
    • 3 Mango
    • 4 Banana
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    Correct answer: Potato

    A potato is a vegetable and the others are fruits.

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  19. Day is to night as light is to:

    • 1 Sun
    • 2 Darkness
    • 3 Lamp
    • 4 Bright
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    Correct answer: Darkness

    They are opposites.

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  20. Find the next letters: AB, CD, EF, GH, ?

    • 1 KL
    • 2 JK
    • 3 IJ
    • 4 HI
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    Correct answer: IJ

    Each pair continues the alphabet.

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  21. If 3 + 4 = 24 and 5 + 6 = 60 by the rule (a x b x 2), then 2 + 7 = ?

    • 1 14
    • 2 18
    • 3 28
    • 4 30
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    Correct answer: 28

    2 x 7 x 2 = 28.

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  22. Find the next number: 1, 1, 2, 3, 5, 8, ?

    • 1 11
    • 2 10
    • 3 12
    • 4 13
    Show answer

    Correct answer: 13

    This is the Fibonacci series, each term is the sum of the previous two.

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