Letter and Symbol Series Questions and Online Test

Wrong Number Series - Page 2
Alphabet Series - Page 3
Letter and Symbol Series Important Questions - Page 4
Letter and Symbol Series Video - Page 5

In this type of test, a series of numbers or alphabetical letters are given in questions. The given series follows a certain rule and pattern throughout in given set. Therefore, you are required to recognize the pattern or rule and to complete the given series or find out the wrong one in the series.

Number Series

In this type of test, a number series is given, out of which one number or alphabet is missing. So you are required to complete the series by analyzing the applied rule or pattern.

Rule for the Number Series

Some of the standard rules followed in estimating the next term are given below:

  1. Each number may be the multiple of the other.
  2. In each number something may be added or deducted to get the second number and so on.
  3. The numbers may be divided to get the next number.
  4. The number may be squared to get the next one.
  5. The square root of the numbers may be taken to get the next number.
  6. Sometimes, odd numbers are followed or preceded by even numbers and vice versa.
  7. Sometimes, sometimes is added to get the next number and subtracted or divided or multiplied to get the next one.
  8. Sometimes, odd number is squared, the other multiplied thrice, fourth multiplied four times, etc. and then sometimes is added or subtracted.

Solved Example - Number Series

Question 1. 20, 32, 45, 59, 74, ?
(A) 95
(B) 90
(C) 85
(D) 79

Solution: The differences between the consecutive terms of the series are 12, 13, 14, 15, 16, …..
2nd term = 1st term + 12 = 20 + 12 = 32
3rd term = 2nd term + 13 = 32 + 13 = 45
4th term = 3rd term + 14 = 45 + 14 = 59
5th term = 4th term + 15 = 59 + 15 = 74
Thus, ? = 6th term = 5th term + 16 = 74 + 16 = 90
Hence, the answer is (B).

Question 2. 210, 195, 175, 150, 120, ?
(A) 75
(B) 80
(C) 85
(D) 90

Solution: The differences between the consecutive terms of the series are -15, -20, -25, -30, -35, …
2nd term = 1st term – 15 = 210 – 15 = 195
3rd term = 2nd term – 20 = 195 – 20 = 175
4th term = 3rd term – 25 = 175 – 25 = 150
5th term = 4th term – 30 = 150 – 30 = 120
Thus, ? = 6th term – 35 = 120 – 35 = 85
Hence, the answer is (C).

Question 3. 3, 5, 10, 12, 24, 26, ?
(A) 52
(B) 30
(C) 28
(D) 48

Solution: Each odd term doubles the previous even term.
3th term = 2×2nd term=2×5=10
5th term = 2×4th term=2×12=24
Thus, = 7th term = 2×6th term=2×26=52
Hence, the answer is (A).
Hence, the answer is (A).

Question 5. 2, 6, 10; 5, 9, 13; 10, 14, 18; ?, ?, ?.
(A) 12, 14, 16
(B) 14, 17, 20
(C) 17, 21, 25
(D) 15, 20, 25

Solution: Each group have a common difference of 4 among its consecutive terms. Also the difference between the consecutive first term of each group is 3, 5, 7, etc.
Thus, ?, ?, ? = ( 10 + 7), (17 + 4), (21 + 4)
= 17, 21, 25,
Hence, the answer is (C).

 

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