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Number Series Questions and Answers page 5

21) F2, __, D8, C16, B32, … What number should fill the blank?

Answer: E4

Explanation: The letters decrease by 1; the numbers are multiplied by 2

22) 664, 332, 340, 170, ____, 89, … What number should fill the blank?

Answer: 178

Explanation: First, divide by 2, and then add 8, So, 170 + 8 = 178

23) V, VIII, XI, XIV, __, XX, … What number should fill the blank?

Answer: XVII

Explanation: each number is 3 more than the previous number.

24) 70, 71, 76, __, 81, 86, 70, 91, … What number should fill the blank?

Answer: 70

Explanation:  5 is added to the previous number; the number 70 is inserted as every third number.

25) 8, 43, 11, 41, __, 39, 17, … What number should fill in the blank?

Answer: 14

Explanation: 1st: 8, 11, __, 17, …. 2nd: 43, 41, 39, …. (+3 in 1st series, -2 in 2nd series) So, 11 + 3 = 14

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