# Aptitude Odd Man Out and Series Test Paper 1

1) Complete the series 2, 5, 9, 19, 37.......

1. 76
2. 74
3. 75
4. None of these.

Explanation:

The second number is one more than twice the first,
2 x 2 +1 = 5

The third number is one less than twice the second,
5 x 2 -1 = 9

The fourth number is one more than twice the third,
9 x 2 +1 = 19

The fifth number is one less than twice the fourth.
19 x 2 - 1 = 37

Therefore, the sixth number is one more than twice the fifth. So, the missing number:
37 x 2 + 1 = 75.

2) The next number of the sequence 0, 7, 26, 63......

1. 124
2. 126
3. 215
4. 217

Explanation:

The terms of the given series are
(13 - 1) = 1 -1 = 0,
(23 - 1) = 8 - 1 = 7,
(33 - 1) = 27 - 1 = 26,
(43 -1) = 64 - 1 = 63.....

So, the next term will be
53 - 1 = 125 - 1 = 124

3) In the following number series, a wrong number is given. Find out that number
8, 18, 40, 86, 178, 370, 752.

1. 18
2. 178
3. 370
4. 40

Explanation:

The given sequence is

x 2 + 2 i.e. 8 x 2 + 2 = 16+2 = 18,
x 2 + 4 i.e. 18 x 2+ 4 = 36+4 = 40,
x 2 + 6 i.e. 40 x 2 + 6 = 80+6 = 86,
x 2 + 8 i.e. 86 x 2 + 8 = 172+8 = 180,
x 2 + 10 i.e. 180 x 2 + 10 = 360+10 = 370,
x 2 + 12 i.e. 370 x 2 + 12 = 740+12 = 752.

Hence, the number 178 is wrong, and it should be replaced by 180.

4) Find out the missing number in the following sequence.
53, 44, 52,?, 51, 46.

1. 45
2. 61
3. 44
4. 62
5. 43

Explanation:

In the given series, there are two sequences:
53, 52, 51, and 44,?, 46

In the first sequence, each digit is decreased by 1
i.e. 53, 52, 51

In the second sequence, each digit is increased by 1
44, 45, 46

Therefore 45 is the missing number.

5) Find out the wrong number in the series:
3, 8, 15, 24, 34, 48, 63

1. 15
2. 24
3. 34
4. 48
5. 63

Explanation:

The differences between consecutive terms are respectively 5, 7, 9, 11, and 13.
So, 34 is the wrong number.

Aptitude Odd Man Out and Series Test Paper 2
Aptitude Odd Man Out and Series Test Paper 3
Odd Man Out and Series Concepts   