Series, codes and puzzles

20 free MDCAT Logical Reasoning MCQs on Series, codes and puzzles (PM&DC syllabus), each with the answer, an explanation and the textbook line it comes from. Tap to check, no sign-up.

Tap an answer to check it · 20 questions

1. Question 1

   Find the next term: 100, 95, 85, 70, ___
   • A50
   • B55
   • C60
   • D45
   Show answer and explanation

   Answer: A) 50

   70 - 20 = 50.

2. Question 2

   Find the next term: 4, 12, 36, 108, ___
   • A216
   • B324
   • C432
   • D144
   Show answer and explanation

   Answer: B) 324

   108 x 3 = 324.

3. Question 3

   Find the next term: 2, 5, 11, 23, 47, ___
   • A96
   • B94
   • C95
   • D91
   Show answer and explanation

   Answer: C) 95

   47 x 2 + 1 = 95.

4. Question 4

   Find the next term: 1, 8, 27, 64, ___
   • A125
   • B100
   • C81
   • D216
   Show answer and explanation

   Answer: A) 125

   5 cubed = 125.

5. Question 5

   Find the next term: 120, 60, 20, 5, ___
   • A2.5
   • B1
   • C0
   • D4
   Show answer and explanation

   Answer: B) 1

   5 / 5 = 1.

6. Question 6

   Find the next letter: Z, X, V, T, ___
   • AP
   • BS
   • CQ
   • DR
   Show answer and explanation

   Answer: D) R

   T - 2 = R.

7. Question 7

   Find the next letter: B, E, H, K, ___
   • AN
   • BM
   • CO
   • DL
   Show answer and explanation

   Answer: A) N

   K + 3 = N.

8. Question 8

   Find the next pair: AZ, BY, CX, ___
   • ADV
   • BDW
   • CEW
   • DCW
   Show answer and explanation

   Answer: B) DW

   D and W.

9. Question 9

   Find the next group: ACE, BDF, CEG, ___
   • ADGH
   • BDEF
   • CCFH
   • DDFH
   Show answer and explanation

   Answer: D) DFH

   D, F, H.

10. Question 10

    Find the next letter: Z, Y, W, T, P, ___
    • AK
    • BL
    • CJ
    • DM
    Show answer and explanation

    Answer: A) K

    P - 5 = K.

11. Question 11

    Find the next pair: AB, DE, GH, ___
    • AIJ
    • BJK
    • CKL
    • DHI
    Show answer and explanation

    Answer: B) JK

    G + 3 = J, then K.

12. Question 12

    Find the next term: 2A, 4C, 8E, 16G, ___
    • A32H
    • B32I
    • C24I
    • D30J
    Show answer and explanation

    Answer: B) 32I

    16 x 2 = 32 and G + 2 = I.

13. Question 13

    M's father is the son of N. How is N related to M?
    • ABrother
    • BFather
    • CUncle
    • DGrandparent
    Show answer and explanation

    Answer: D) Grandparent

    N's son is M's father.

14. Question 14

    Bilal walks 6 km east, then 8 km north, then 6 km west. Where is he from the start?
    • A8 km South
    • B6 km East
    • C10 km North
    • D8 km North
    Show answer and explanation

    Answer: D) 8 km North

    Only the 8 km north remains.

15. Question 15

    Sana is 7th from the left and 10th from the right in a row. How many people are in the row?
    • A18
    • B17
    • C15
    • D16
    Show answer and explanation

    Answer: D) 16

    7 + 10 - 1 = 16.

16. Question 16

    A is taller than B. C is taller than A. D is shorter than B. Who is the shortest?
    • AB
    • BD
    • CA
    • DC
    Show answer and explanation

    Answer: B) D

    C > A > B > D.

17. Question 17

    A is taller than B. C is taller than A. D is shorter than B. Who is the second tallest?
    • AB
    • BC
    • CA
    • DD
    Show answer and explanation

    Answer: C) A

    C > A > B > D.

18. Question 18

    If today is Wednesday, what day of the week will it be after 45 days?
    • AThursday
    • BFriday
    • CSunday
    • DSaturday
    Show answer and explanation

    Answer: D) Saturday

    45 = 6 weeks + 3 days; Wednesday + 3 = Saturday.

19. Question 19

    If 1 March is a Monday, what day of the week is 31 March?
    • AWednesday
    • BTuesday
    • CThursday
    • DMonday
    Show answer and explanation

    Answer: A) Wednesday

    30 days later = 4 weeks + 2 days.

20. Question 20

    What is the angle between the hour and minute hands of a clock at 3:30?
    • A90 degrees
    • B75 degrees
    • C60 degrees
    • D105 degrees
    Show answer and explanation

    Answer: B) 75 degrees

    |90 - 165| = 75 degrees.

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