Verbal Reasoning - Series Completion - Discussion
Discussion Forum : Series Completion - Section 1 (Q.No. 48)
Directions to Solve
Choose the correct alternative that will continue the same pattern and replace the question mark in the given series.
48.
2, 7, 27, 107, 427, ?
Answer: Option
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.
Discussion:
3 comments Page 1 of 1.
Subhra Sankha Saha said:
1 decade ago
7-2=5
27-7=20
107-27=80
427-107=320.
5*4=20
20*4=80
80*4=320
320*4=1280
1280+427=1707.(Ans)
27-7=20
107-27=80
427-107=320.
5*4=20
20*4=80
80*4=320
320*4=1280
1280+427=1707.(Ans)
VENU L said:
1 decade ago
2*4=8 ; 8-1=7.
7*4=28 ; 28-1=27.
27*4=108 ; 108-1=107.
107*4=428 ; 428-1=427.
427*4=1708 ; 1708-1=1707.
7*4=28 ; 28-1=27.
27*4=108 ; 108-1=107.
107*4=428 ; 428-1=427.
427*4=1708 ; 1708-1=1707.
(3)
Abhishek said:
9 years ago
Here the logic is (x * 4) - 1.
(2 * 4) - 1 = 8 - 1 = 7.
(7 * 4) - 1 = 28 - 1 = 27.
(27 * 4) - 1 = 108 - 1 = 107.
(107 * 4 - 1 = 428 - 1= 427.
(427 * 4) - 1 = 1708 - 1 = 1707.
Therefore, the series is 2, 7, 27, 107, 427, 1707.
(2 * 4) - 1 = 8 - 1 = 7.
(7 * 4) - 1 = 28 - 1 = 27.
(27 * 4) - 1 = 108 - 1 = 107.
(107 * 4 - 1 = 428 - 1= 427.
(427 * 4) - 1 = 1708 - 1 = 1707.
Therefore, the series is 2, 7, 27, 107, 427, 1707.
(9)
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