# Series Practice test

Complete the series 26, 19, 17, 13, 11, ?, 8, 7

**Answer:**Option A

**Explanation:**

26, 17,11, 8 these are decreasing like 9, 6, and 3

19, 13, 9, and 7 these are decreasing like 6, 4, and 2

Look at this series: 4, 7, 25, 10, __, 20, 16, 19… What number should fill the blank?

**Answer:**Option A

**Explanation:**

Two series alternate here, with every third number following a different pattern.

In the main series, 3 are added to each number to arrive at the next.

In the alternating series, 5 is subtracted from each number to arrive at the next.

Find odd number from series 8, 27, 64, 100, 125, 216, 343

**Answer:**Option B

**Explanation:**

The pattern is 2^3, 3^3, 4^3, 5^3, 6^3, 7^3.

But, 100 is not a perfect cube.

3,15,35,63,_____

**Answer:**Option D

**Explanation:**

3*5 =15

5*7 = 35

7*9 = 63

9*11 = 99

1,1,2,6,24,____

**Answer:**Option D

**Explanation:**

1*1 = 1

1* 2 = 2

2*3 = 6

6*4 = 24

101,122,145,_____

**Answer:**Option A

**Explanation:**

101 + 21 = 122

122 + 23 = 145

145 + 25 = 170

8, 7, 11, 12, 14, 17, 17, 22, (….)

**Answer:**Option B

**Explanation:**

There are two series (8, 11, 14, 17, 20) and (7, 12, 17, 22) increasing by 3 and 5 respectively.

9, 11, 20, 31, (…..), 82

**Answer:**Option B

**Explanation:**

Each term in the series is the sum of the preceding two terms.

Missing number = 20 + 31 = 51.

Given the sequence A, BB, CCC, DDDD………..and so on , the 240th letter in the sequence will be:

**Answer:**Option A

In the following question, one term is missing as shown by ? . Choose the missing term out of the given alternatives.

AB, DEF, HIJK, ? , STUVWX

**Answer:**Option A

**Explanation:**

The number of letters in the terms goes on increasing by one at each step. Each term consists of letters in alphabetic order. The last letter of each term and first letter of next term are alternate.