Series Completion

Series Completion

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Your answers are highlighted below.
Question 1
Choose the correct no to replace ? : 120, 99, 80, 63, 48, ?
A
35
B
38
C
40
D
45
Question 1 Explanation: 
The pattern is - 21, - 19, - 17, - 15,..... So, missing term = 48 - 13 = 35.
Question 2
Choose the correct no to replace ? : 589654237, 89654237, 8965423, 965423, ?
A
58965
B
65423
C
89654
D
96542
Question 2 Explanation: 
The digits are removed one by one from the beginning and the end in order alternately so as to obtain the subsequent terms of the series.
Question 3
Choose the correct no to replace ? : 3, 10, 101,?
A
10101
B
10201
C
10202
D
11012
Question 3 Explanation: 
Each term in the series is obtained by adding 1 to the square of the preceding term. So, missing term = (101)2 + 1 = 10202.
Question 4
In the series 2, 6, 18, 54, ...... what will be the 8th term ?
A
4370
B
4374
C
7443
D
7434
Question 4 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 = ar^(8-1) = ar^7 = 2 x 3^7 = (2 x 2187) = 4374.
Question 5
Choose the correct no to replace ? : 125,80,45,20,?
A
5
B
8
C
10
D
12
Question 5 Explanation: 
he pattern is - 45, - 35, - 25, ..... So, missing term = 20 - 15 = 5.
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There are 5 questions to complete.

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