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:
110 comments Page 10 of 11.
Atul said:
1 decade ago
25*02+15+54-25*15/25.
Suresha c n said:
1 decade ago
Is any other easy way except mentioned above all?
Suranjika Muni said:
1 decade ago
This is good process through which one will improve his/her mental ability.
Ram babu said:
1 decade ago
One said that by adding the first 3 no's we can get 4th and adding next 3 no's we get 6th but it's wrong. Because if we follow this how we can get 2nd and 3rd no's.
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.
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