Logical Reasoning - Number Series - Discussion
Discussion Forum : Number Series - Type 1 (Q.No. 19)
Directions to Solve
In each series, look for the degree and direction of change between the numbers. In other words, do the numbers increase or decrease, and by how much
19.
Look at this series: 8, 6, 9, 23, 87 , ... What number should come next?
Answer: Option
Explanation:
8 x 1 - 2 = 6
6 x 2 - 3 = 9
9 x 3 - 4 = 23
23 x 4 - 5 = 87
87 x 5 - 6 = 429 ...
Discussion:
116 comments Page 11 of 12.
Manoj tetwar said:
1 decade ago
No one can predict what comes next, if the series is given like this and the rest of the questions are good but very easy.
Guruprasad said:
1 decade ago
Given pro having 8, 6, 9, 23, 87.
We have to do,
8*1 = 8-2 = 6,(8 is the given no, it is in 1 place so 8*1=8 we want next no in the given series we have to subtract 8-2=6).
We follow this method remains all.
We have to do,
8*1 = 8-2 = 6,(8 is the given no, it is in 1 place so 8*1=8 we want next no in the given series we have to subtract 8-2=6).
We follow this method remains all.
Stefy said:
1 decade ago
Very confusing. I've got this solution adding the first 3 numbers (23)and then adding the third, fourth and fifth together
8, 6, 9, 23, 87
8+6+9 = 23.
9+23+87 = 128.
Can anybody explain why this solution is not correct?
8, 6, 9, 23, 87
8+6+9 = 23.
9+23+87 = 128.
Can anybody explain why this solution is not correct?
Hasan Faraz said:
1 decade ago
In Type 1 this is the only question that required logical thinking, rest all questions were comparatively very easy.
Surendar jala said:
1 decade ago
Understanding logic is some what difficult.
Dinendra Pal said:
1 decade ago
Simple dear how can see,
8*1 = 8-2 --> 6 1st num.
6*2 = 12-3 --> 9 2nd num.
9*3 = 27-4 --> 23 3rd num.
23*4 = 92-5 --> 87 4th num.
87*5 = 435-6 --> 429 Answer.
8*1 = 8-2 --> 6 1st num.
6*2 = 12-3 --> 9 2nd num.
9*3 = 27-4 --> 23 3rd num.
23*4 = 92-5 --> 87 4th num.
87*5 = 435-6 --> 429 Answer.
Laxmikanth Jamadar said:
1 decade ago
Yes ! Your Right Sir after 429 number should come next 2567.
It is 429*6-7= 2567 so that again calculate continuously...
It is 429*6-7= 2567 so that again calculate continuously...
Samuel said:
1 decade ago
No one can guess it. How difficult it is.
Nand Kishore said:
1 decade ago
It very complicated but very easy if understand thanks to the all persons commented on this, which make me understand so nicely and perfectly.
Arun said:
1 decade ago
No one can predict what comes next, if the series is given like this and the rest of the questions are good but very easy.
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