Odd Man Out And Series

Question:
7, 8, 18, 57, 228, 1165, 6996

[A].

8

[B].

18

[C].

57

[D].

228

Answer: Option D

Explanation:

Let the given numbers be A, B, C, D, E, F, G.

Then, A, A x 1 + 1, B x 2 + 2, C x 3 + 3, D x 4 + 4, E x 5 + 5, F x 6 + 6 are the required numbers.

Clearly, 228 is wrong.

Question: 64, 71, 80, 91, 104, 119, 135, 155
[A].

71

[B].

80

[C].

104

[D].

119

Answer: Option E

Explanation:

Go on adding 7, 9, 11, 13, 15, 17, 19 respectively to obtain the next number.

So, 135 is wrong.

Question:
40960, 10240, 2560, 640, 200, 40, 10

[A].

640

[B].

40

[C].

200

[D].

2560

Answer: Option C

Explanation:

Go on dividing by 4 to get the next number.

So, 200 is wrong.

Question:
1, 1, 2, 6, 24, 96, 720

[A].

720

[B].

96

[C].

24

[D].

6

Answer: Option B

Explanation:

Go on multiplying with 1, 2, 3, 4, 5, 6 to get next number.

So, 96 is wrong.

Question: 190, 166, 145, 128, 112, 100, 91
[A].

100

[B].

166

[C].

145

[D].

128

Answer: Option D

Explanation:

Go on subtracting 24, 21, 18, 15, 12, 9 from the numbers to get the next number.

190 – 24 = 166
166 – 21 = 145
145 – 18 = 127 [Here, 128 is placed instead of 127]
127 – 15 = 112
112 – 12 = 100 … and so on.

Therefore, 128 is wrong.

Question:
10, 5, 13, 10, 16, 20, 19, (….)

[A].

22

[B].

40

[C].

38

[D].

23

Answer: Option B

Explanation:

There are two series (10, 13, 16, 19) and (5, 10, 20, 40), one increasing by 3 and the other multiplied by 2.

Question: 8, 7, 11, 12, 14, 17, 17, 22, (….)

[A].

27

[B].

20

[C].

22

[D].

24

Answer: Option B

Explanation:

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

Question:
2, 4, 12, 48, 240, (….)

[A].

960

[B].

1440

[C].

1080

[D].

1920

Answer: Option B

Explanation:

Go on multiplying the given numbers by 2, 3, 4, 5, 6.

So, the correct next number is 1440.

Question:
7, 26, 63, 124, 215, 342, (….)

[A].

481

[B].

511

[C].

391

[D].

421

Answer: Option B

Explanation:

Numbers are (23 – 1), (33 – 1), (43 – 1), (53 – 1), (63 – 1), (73 – 1) etc.

So, the next number is (83 – 1) = (512 – 1) = 511.

Question: 8, 24, 12, 36, 18, 54, (….)
[A].

27

[B].

108

[C].

68

[D].

72

Answer: Option A

Explanation:

Numbers are alternatively multiplied by 3 and divided by 2.

So, the next number = 54 ÷ 2 = 27.