Number Series

Consider the following series: X, Z, B, D. What letter should come next? a. E b. F c. G d. H

B) F NS Pattern: Every other letter is present. Ex. In X --> Z, Y is skipped; in Z --> B, A is skipped; in B --> D, C is skipped, etc. Therefore, D --> ? = D, E, F, where ? = F

Consider the following series: L, O, R, ..., X. What is the missing letter? a. S b. U c. T d. M

B) U NS Pattern: 2 letters are skipped every time. Ex. In L --> O, M and N were skipped; in O --> R, P and Q were skipped, etc. Therefore, R --> ? = R, S, T, U, where ? = U

Consider the following series: 26, 21, , 11, 6. What is the missing number? a. 27 b. 23 c. 16 d. 29

C) 16 NS Pattern: Each consequent number is 5 less than the previous one. Therefore, 21 - 5 = 16

Consider the following series: 23, ..., 31, 37. What is the missing number? a. 19 b. 27 c. 29 d. 30

A) 19 NS Pattern: They are all prime numbers (only divisible by 1 and themselves)

Consider the following series: 5, 6, 11, 17. What number should come next? a. 28 b. 34 c. 36 d. 27

A) 28 NS Pattern: Each number is the previous two numbers. Ex. 6 + 5 = 11, 11 + 6 = 17, etc. Therefore, 17 + 11 = 28

Consider the following series: 26, 24, 20, 14. What number should come next? a. 6 b. 18 c. 12 d. 8

A) 6 NS Pattern: Each number is being subtracted by 2n to get the next number. Ex. 26 - 2(1) = 24, 24 - 2(2) = 20, 20 - 2(3) = 14, etc. Therefore, 14 - 2(4) = 14 - 8 = 6

Consider the following series: 3, 6, 11, 18. What number should come next? a. 30 b. 27 c. 22 d. 29

B) 27 NS Pattern: The difference between two numbers increases by 2 each time. Ex. 3 + 3 = 6, 6 + 5 = 11, 11 + 7 = 18, etc. Therefore, 18 + 9 = 27

Consider the following series: 6, 8, 4, 10, 18, 22. What number should come next? a. 34 b. 32 c. 24 d. 26

B) 32 NS Pattern: Each number is the sum of the previous and the number 2 places to the left. Ex. 10 = 6 + 4, 18 = 10 + 8, 22 = 18 + 4 Therefore, 22 + 10 = 32

Consider the following series: 25, 33, 41, 49. What number should come next? a. 51 b. 55 c. 59 d. 57

D) 57 NS Pattern: Each number is increasing by 8 each time. Ex. 25 + 8 = 25, 33 + 8 = 41, 41 + 8 = 49 Therefore, 49 + 8 = 57

Consider the following series: 6, 12, 24, 48. What number should come next? a. 48 b. 64 c. 60 d. 96

D) 96 NS Pattern: Each number is multiplied by 2 to get the next number. Therefore, 48 x 2 = 96

What is the missing number in the following pattern? -4, ?, -1, 2, 6, 11... a) -2 b) -1 c) 0 d) None of the above.

D) None of the above The pattern of this number series is a + (Na), as in, you are adding the position of the number to itself. For example, 2 is the 4th number in the series, so 2 + 4 = 6, and then 6 is the 5th number in the series, so 6 + 5 = 11. The ? is the 2nd number in the series, so ? + 2 = -1, therefore, ? = -3, which is not listed as an option.