## Here are different types of questions and answers based on Number Series that are asked various competitive exams.

Number series is a sequential arrangement of number. A number series can be formed by using various characteristics of numbers and by using various types of calculations.

Q1. 5. 6, 11, 21, 36, 56, ?

A. 75

B. 80

C. 81

D. 85

Show Answer

Answer: B. 81-A Pattern is +5, +10, + 15, +20

Next number in the series will be 56 + 25 = 81

Q2. 1, 3, 4, 8, 15, 27, ?

A. 35

B. 40

C. 45

D. 50

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Answer: D. 50-The Sum of any three consecutive terms of the series given to the next term.

So, missing number = 8 + 15 + 27 = 50.

Q3. 2, 15, 4, 12, 6, 7, ?, ?

A. 8, 0

B. 8, 1

C. 3, 3

D. None of the above

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Answer: A. 8, 0-Let the missing terms of the series be x1 and x2.

Thus, the sequence 2, 15, 4, 12, 6, 7, x1 x2 is a combination of two series :

I. 2, 4, 6, x1 and II. 15, 12, 7, x2I consists of consecutive even numbers.

So, missing term, x1 = 8.

The pattern in II is – 3, – 5,……So, missing term, x2 = 7 – 7 = 0.

Q4. 5, 9, 17, 29, 45, … ?

A. 55

B. 65

C. 75

D. 80

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Answer: B. 65-Pattern in the series is +4, +8, +12, +16.

Next term will be 45 + 20 = 65

Q5. 2, 3, 5, 7, 11, ?, 17

A. 9

B. 11

C. 13

D. 15

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Answer: C. 13-Clearly, the given series consists of prime numbers starting from 2. The prime number after 11 is 13. So, 13 is the missing number.