Alphanumeric Series Quiz: Reasoning Practice

Spoilers! These are the Starter quiz’s answers. Easy, Medium, Hard and Mixed rounds show their own answers when you finish.

1. Series: R 4 # T 7 M @ 2 K 9 $ E 3 B & 5 P % 8 W U 6 * J. How many symbols are there in this series, each of which is immediately preceded by a digit and immediately followed by a letter?

   • 2
   • 3
   • 4
   • 1

   Answer: 3. The qualifying groups are 4 # T, 9 $ E and 6 * J. The other symbols (@, &, %) are preceded by letters.

2. Series: R 4 # T 7 M @ 2 K 9 $ E 3 B & 5 P % 8 W U 6 * J. Which element is 6th to the right of the 9th element from the left end?

   • $
   • B
   • &
   • P

   Answer: &. 6th to the right of the 9th from the left is the (9 + 6) = 15th element from the left. Counting: ...K (9), 9, $, E, 3, B, & (15).

3. Series: D 5 % K 8 A # 3 L @ 6 N E 2 $ H 7 * U 9 F & 4 G. If all the symbols are removed, which element will be 6th from the right end?

   • 7
   • 2
   • H
   • U

   Answer: 7. Without symbols the series ends ... E 2 H 7 U 9 F 4 G. Counting from the right: G, 4, F, 9, U, 7 — the 6th is 7.

4. Series: D 5 % K 8 A # 3 L @ 6 N E 2 $ H 7 * U 9 F & 4 G. How many digits are there, each of which is immediately preceded by a consonant and immediately followed by a symbol?

   • 1
   • 3
   • 4
   • 2

   Answer: 2. Only D 5 % and H 7 * qualify. In E 2 $ the letter before 2 is a vowel, and the other digits are followed by letters.

5. If the digits of the number 61948372 are arranged in descending order, how many digits will remain in the same position?

   • None
   • Two
   • One
   • Three

   Answer: One. Descending order gives 98764321. Comparing place by place with 61948372, only the 6th digit (3) is unchanged.

6. If the letters of the word PLANTER are arranged in alphabetical order, how many letters will remain in the same position?

   • One
   • None
   • Two
   • Three

   Answer: One. Alphabetical order is AELNPRT. Compared with PLANTER, only N (4th place) stays where it was.

7. How many pairs of letters are there in the word MONARCH, each of which has as many letters between them in the word as in the English alphabet (counting both forward and backward)?

   • Two
   • Three
   • One
   • Four

   Answer: Three. ON (adjacent in both), OR (two letters between in both) and AC (one letter between in both). No other pair matches.

8. Five numbers are given: 492 637 815 268 359. If the first and third digits of each number are interchanged, which original number becomes the largest?

   • 815
   • 637
   • 359
   • 268

   Answer: 359. After the swap the numbers are 294, 736, 518, 862 and 953. The largest, 953, comes from 359.

9. Series: 3 7 5 2 3 7 8 9 7 3 5 3 7 5 1 3 7 2 4 7 5 3 7 9. How many 7s are there, each of which is immediately preceded by 3 but not immediately followed by 5?

   • 2
   • 4
   • 5
   • 3

   Answer: 3. Five 7s follow a 3: 3 7 5, 3 7 8, 3 7 5, 3 7 2 and 3 7 9. Removing the two followed by 5 leaves 3.

10. If the second half of the English alphabet (N to Z) is written in reverse order while the first half stays as it is, which letter will be 5th to the right of the 15th letter from the left?

    • S
    • T
    • U
    • Q

    Answer: T. The new order is A to M, then Z, Y, X, W, V, U, T... The 15th letter is Y, and 5th to its right is the 20th letter, T.