series completion verbal reasoning questions

Directions to Solve

Choose the correct alternative that will continue the same pattern and replace the question mark in the given series.

46.

10, 100, 200, 310, ?
A.     400    B.     410
C.     420    D.     430
Answer & Explanation

Answer: Option D

Explanation:

The pattern is + 90 + 100, + 110,…..

So, missing term = 310 + 120 = 430.

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47.

11, 10, ?, 100, 1001, 1000, 10001
A.     101
B.     110
C.     111
D.     None of these
Answer & Explanation

Answer: Option A

Explanation:

The pattern is – 1, x 10 + 1, – 1, x 10 + 1, – 1, x 10 + 1, …..

So, missing term = 10 x 10 + 1 = 101.

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48.

2, 7, 27, 107, 427, ?
A.     1262    B.     1707
C.     4027    D.     4207
Answer & Explanation

Answer: Option B

Explanation:

The pattern is + 5, + 20, + 80, + 320, …… i.e. + (5 x 12), + (5 x 22), + (5 x 42), + (5 x 82),…..

So, missing term = 427 + (5 x 162) = 427 + 1280 = 1707.