Logical Reasoning - Number Series - Discussion
Discussion Forum : Number Series - Type 2 (Q.No. 15)
Directions to Solve
Look carefully for the pattern, and then choose which pair of numbers comes next.
15.
61 57 50 61 43 36 61
Answer: Option
Explanation:
This is an alternating repetition series, in which a random number, 61, is interpolated as every third number into an otherwise simple subtraction series. Starting with the second number, 57, each number (except 61) is 7 less than the previous number.
Discussion:
16 comments Page 1 of 2.
Vikas said:
6 months ago
Thanks all for explaining the answer.
Ram said:
3 years ago
Nice Explanation, Thank you. @Sundar.
(1)
Swarnadipa said:
5 years ago
@Laali .
See in this series first, the fourth and seventh number is identical.
61 57 50 61 43 36 61.
So the difference in second and third number is 7
57-7=50.
Again the difference in fifth and sixth number is 7.
50-7=43
43-7=36.
So after 61 in the seventh position.
36-7=29.
29-7=22.
See in this series first, the fourth and seventh number is identical.
61 57 50 61 43 36 61.
So the difference in second and third number is 7
57-7=50.
Again the difference in fifth and sixth number is 7.
50-7=43
43-7=36.
So after 61 in the seventh position.
36-7=29.
29-7=22.
(8)
Laali said:
5 years ago
Why it is not 29 61? Explain.
(5)
Sanju said:
6 years ago
Why not 27 and 20? It too has a difference of 7. Please, anyone, tell me.
(14)
Trinh said:
7 years ago
[61] 57 50 [61] 43 36 [61] __ __ and so on.
57 - 14 = 43.
50 - 14 = 36.
==> 43 - 14 = 29; 36 - 14 = 22.
The answer is 29 and 22.
57 - 14 = 43.
50 - 14 = 36.
==> 43 - 14 = 29; 36 - 14 = 22.
The answer is 29 and 22.
(14)
Sowmya said:
7 years ago
Nice explanation, Thanks @Sundar.
(2)
Gaphur said:
9 years ago
No, option c is the correct answer.
(1)
Vinay kumar said:
1 decade ago
Find the given series in an direction.
The pair is 29, 22
How means,
61 57 50 61 43 36 61.
61-57 = 4.
(adding 7 of each ans.).
61-50 = 11.
61-43 = 18.
61-36 = 25.
61-(29) = 32.
61-(22) = 39.
(or)
In series you take 3 no.s.
Difference b/n 57&50 with respect to 43 &36 is 14.
43-14 = 29.
36-14 = 22.
Pair is(29 22).
The pair is 29, 22
How means,
61 57 50 61 43 36 61.
61-57 = 4.
(adding 7 of each ans.).
61-50 = 11.
61-43 = 18.
61-36 = 25.
61-(29) = 32.
61-(22) = 39.
(or)
In series you take 3 no.s.
Difference b/n 57&50 with respect to 43 &36 is 14.
43-14 = 29.
36-14 = 22.
Pair is(29 22).
Gaurav Agarwal said:
1 decade ago
Guys,
I guess there are two trends which are prominent in the data set.
One- Is explained above and has been termed as right answer.
The other one is as below:
61
57 61-57 -4.
50 57-50 -7.
61 50-61 11 (Its the sum of prev two differences).
43 61-43 -18.
36 43-36 -7.
61 36-61 25 (Its the sum of prev two differences).
27 61-27 -34.
20 27-20 -7.
61 20-61 41 (Its the sum of prev two differences).
Correct Answer through this method: 27 20.
I guess there are two trends which are prominent in the data set.
One- Is explained above and has been termed as right answer.
The other one is as below:
61
57 61-57 -4.
50 57-50 -7.
61 50-61 11 (Its the sum of prev two differences).
43 61-43 -18.
36 43-36 -7.
61 36-61 25 (Its the sum of prev two differences).
27 61-27 -34.
20 27-20 -7.
61 20-61 41 (Its the sum of prev two differences).
Correct Answer through this method: 27 20.
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