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 3 of 11.
Mathpati ashwini said:
2 years ago
Very helpful explanation, thank you so much.
(25)
Vengence said:
2 years ago
Very helpful. Thank you, everyone.
(17)
Raju patanker said:
3 years ago
Very good explanation. Thanks.
(15)
Priyambika pattnayak said:
3 years ago
8 * 1 = 8 - 2 = 6.
6 * 2 = 12 - 3 = 9,
9 * 3 = 27 - 4 = 23,
23 * 4 = 92 - 5 = 87,
87 * 5 = 435 - 6 = 429.
6 * 2 = 12 - 3 = 9,
9 * 3 = 27 - 4 = 23,
23 * 4 = 92 - 5 = 87,
87 * 5 = 435 - 6 = 429.
(53)
Aanchalpulast said:
3 years ago
Thanks everyone for explaining it.
(8)
Harshit said:
3 years ago
Thanks everyone for explaining the answer.
(8)
Equleus said:
4 years ago
@Stefy,
Although we can indeed use the logic of adding the 1st 2nd 3rd and then the 3rd 4th 5th, through this method there is no way to derive the 2nd number, and the others as well,
Generally, a sequence series has to be applied so that you can find n and n +1 using the same formula. You shouldn't have to need to use n, n+1, n+2 to find n+3.
Hope this Helped! (To all the others who chance across this forum as well).
Although we can indeed use the logic of adding the 1st 2nd 3rd and then the 3rd 4th 5th, through this method there is no way to derive the 2nd number, and the others as well,
Generally, a sequence series has to be applied so that you can find n and n +1 using the same formula. You shouldn't have to need to use n, n+1, n+2 to find n+3.
Hope this Helped! (To all the others who chance across this forum as well).
(5)
Palak said:
4 years ago
8*1-2 = 6.
6*2-3 = 9.
87*5-6 = 429.
6*2-3 = 9.
87*5-6 = 429.
(3)
Prateek said:
4 years ago
Thanks @Akshara.
(1)
Akshara said:
4 years ago
You can understand this problem by understanding the relation between 9, 23 as shown in the solution 9'-3-4=23, and later you check the remaining numbers by using this method.
If it suitable for every number before 9 then you can do this with 87.
If it suitable for every number before 9 then you can do this with 87.
(1)
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