Series Completion

Question: A, G, L, P, S, ?
[A].

U

[B].

W

[C].

X

[D].

Y

Answer: Option A

Explanation:

Question: Z, ?, T, ?, N, ?, H, ?, B
[A].

W, Q, K, E

[B].

W, R, K, E

[C].

X, Q, K, E

[D].

X, R, K, E

Answer: Option A

Explanation:

Question: H, I, K, N, ?
[A].

O

[B].

Q

[C].

R

[D].

S

Answer: Option C

Explanation:

Question: B, D, F, I, L, P, ?
[A].

R

[B].

S

[C].

T

[D].

U

Answer: Option C

Explanation:

Question: 93, 309, 434, 498, 521, 533
[A].

309

[B].

434

[C].

498

[D].

521

Answer: Option D

Explanation:

The correct pattern is + 63, + 53, + 43, + 33, …..

So, 521 is wrong and must be replaced by (498 + 33) i.e. 525.

Question: 8, 14, 26, 48, 98, 194, 386
[A].

14

[B].

48

[C].

98

[D].

194

Answer: Option B

Explanation:

The correct pattern is x 2 – 2.

So, 48 is wrong and must be replaced by (26 x 2 – 2) i.e. 50.

Question: 89, 78, 86, 80, 85, 82, 83
[A].

83

[B].

82

[C].

86

[D].

78

Answer: Option C

Explanation:

The correct pattern is – 11, + 9, – 7, + 5, – 3, + 1.

So, 86 is wrong and must be replaced by (78 + 9) i.e. 87.

Question: In the series 2, 6, 18, 54, …… what will be the 8th term ?
[A].

4370

[B].

4374

[C].

7443

[D].

7434

Answer: Option B

Explanation:

Clearly, 2 x 3 = 6, 6 x 3 = 18, 18 x 3 = 54,…..

So, the series is a G.P. in which a = 2, r = 3.

Therefore 8th term = ar8-1 = ar7 = 2 x 37 = (2 x 2187) = 4374.

Question: In the series 3, 9, 15, …… what will be the 21st term?
[A].

117

[B].

121

[C].

123

[D].

129

Answer: Option C

Explanation:

Clearly, 3 + 6 = 9, 9 + 6 = 15,…..

So, the series is an A.P. in which a = 3 and d = 6.

Therefore 21st term = a + (21 – 1) d = a + 20d = 3 + 20 x 6 = 123.

Question: Which of the following will not be a number of the series 1, 8, 27, 64, 125,…..?
[A].

256

[B].

512

[C].

729

[D].

1000

Answer: Option A

Explanation:

The given series consists of cubes of natural numbers only. 256 is not the cube of

any natural number.