Free Letter, Symbol and Number Series MCQs with Answers

• A. 31
• B. 32
• C. 33
• D. 34

Explanation: The increases alternate between 1 and even numbers that rise by 2: 4, 1, 6, 1, 8, 1. The next increase is 10, so the answer is 33.

• A. 34
• B. 35
• C. 36
• D. 37

Explanation: The differences are 1, 2, 3, 5, and 8, which are consecutive Fibonacci numbers. The next difference is 13, so 23 plus 13 equals 36.

• A. 108
• B. 110
• C. 112
• D. 114

Explanation: The operations alternate between multiplying by 2 and adding increasing numbers: times 2, plus 4, times 2, plus 5, times 2, plus 6.

• A. 36
• B. 38
• C. 39
• D. 40

Explanation: Each term is 9 less than the previous term. Therefore, 45 minus 9 equals 36.

• A. Forty-nine
• B. Forty-eight
• C. Fifty-one
• D. Fifty-four

Explanation: These are the squares of consecutive integers: 1² through 6². The next term is 7², which equals 49.

• A. 486
• B. 729
• C. 972
• D. 1,215

Explanation: Each term is multiplied by 3 to produce the next term. Thus, 243 multiplied by 3 equals 729.

• A. 3
• B. 4
• C. 6
• D. 8

Explanation: Each term is half of the preceding term. Half of 12 is 6, so the next number is 6.

• A. 43
• B. 44
• C. 45
• D. 46

Explanation: The differences are 3, 5, 7, and 9, which increase by 2 each time. The next difference is 11, so 34 plus 11 equals 45.

• A. 91
• B. 92
• C. 93
• D. 94

Explanation: The differences are 4, 9, 16, and 25, which are consecutive squares. The next difference is 36, giving 57 plus 36 equals 93.

• A. 50
• B. 52
• C. 54
• D. 56

Explanation: The operations alternate between multiplying by 2 and subtracting 2. After 26, multiply by 2 to get 52.

• A. 168
• B. 169
• C. 171
• D. 174

Explanation: The pattern alternates between adding 3 and multiplying by 3. The next operation is multiplication, so 57 multiplied by 3 equals 171.

• A. 14
• B. 15
• C. 16
• D. 18

Explanation: The odd-positioned terms are consecutive prime numbers: 2, 3, 5, 7. The even-positioned terms are consecutive squares: 2², 3², 4², 5², so…

• A. 14
• B. 15
• C. 16
• D. 18

Explanation: The terms in odd positions are 1, 3, 5, and 7, while the even positions are squares of consecutive integers.

• A. 2500
• B. 3125
• C. 3750
• D. 6250

Explanation: Each term is multiplied by 5 to obtain the next term. Therefore, 625 × 5 = 3125.

• A. 11
• B. 12
• C. 13
• D. 14

Explanation: Each term is the sum of the two terms before it. Thus, 5 + 8 = 13.

• A. 64
• B. 67
• C. 70
• D. 73

Explanation: The differences are 3, 6, 9, 12 and 15, increasing by 3 each time. The next difference is 18, so 49 + 18 = 67.

• A. 206
• B. 210
• C. 214
• D. 218

Explanation: The operations alternate between multiplying by 3 and adding 4. After 70, multiply by 3: 70 × 3 = 210.

• A. 71
• B. 72
• C. 73
• D. 74

Explanation: The sequence alternates multiplication by 2 with additions of 2, 3, 4 and then 5. After 68, add 5 to get 73.

• A. 136
• B. 138
• C. 140
• D. 142

Explanation: The operations alternate between multiplying by 2 and adding consecutive prime numbers: ×2, +5, ×2, +7, ×2, +11, ×2.

• A. DF
• B. DG
• C. EF
• D. DE

Explanation: In each pair, both letters move one place forward alphabetically. After AC, BD and CE, the next pair is DF.