Question Detail

Which number should be replaced with x in following series :

2, 3, 5, 7, 11, x, 17

Answer: Option B

Explanation:

Above series contains prime number series. So after 11, 13 is next prime number.

1. Complete the series
1,6,13,22,33,...

Answer: Option A

Explanation:

Pattern is +5, +7, +9, +11
So next number will be +13
=> 33+13 = 46

2. Which number should be replaced with x in following series :

2, 3, 5, 7, 11, x, 17

Answer: Option B

Explanation:

Above series contains prime number series. So after 11, 13 is next prime number.

3. 1,1,3,9,6,36,10,100,(..),225

Answer: Option D

Explanation:

Given sequence is combination of two series
Series 1 : 1,3,6,10,..
Series 2 : 1,9,36,100,225

In series 1 pattern is +2, +3, +4. So next term will be
10+5 = 15

4. 8, 9, 8, 7, 10, 9, 6, 11, 10, (...), 12

Answer: Option C

Explanation:

Please note that above sequence is containing 3 series
Series 1 : 8, 7, 6, (..)
Series 2 : 9, 10, 11, 12
Series 3 : 8, 9, 10

In series 1 pattern is -1. So missing term will be 6-1 = 5