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 4 of 11.
Aayush said:
5 years ago
Solution : 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.
6 x 2 - 3 = 9,
9 x 3 - 4 = 23,
23 x 4 - 5 = 87,
87 x 5 - 6 = 429.
(1)
Atchaya said:
5 years ago
Yeah, anyone please explain it in clear.
Vishnu kumar said:
5 years ago
Please explain the problem in detail.
Himanshu khatik said:
5 years ago
Nice, Thanks all for explaining.
Uma mahi said:
5 years ago
How to find out this given series?
Gunjan said:
6 years ago
This is very easy to solve. Those who are basic learners in reasoning can easily solve it.
Jitumani Bhagabati said:
6 years ago
8 * 1 - 2 = 6
6 * 2 - 3 = 9
9 * 3 - 4 = 23
23 * 4 - 5 = 87
87 * 5 - 6 = 429.
6 * 2 - 3 = 9
9 * 3 - 4 = 23
23 * 4 - 5 = 87
87 * 5 - 6 = 429.
David Jp said:
7 years ago
@ALL.
As per my knowledge, this will go like.
a will start from 1 and increase to 1 in next , b start from 2 and increase 1.
8 x a - b = 6,
6 x (a++) - (b++),
9 x (a++) - (b++),
23 x (a++) - (b++),
87 x (a++) - (b++).
As per my knowledge, this will go like.
a will start from 1 and increase to 1 in next , b start from 2 and increase 1.
8 x a - b = 6,
6 x (a++) - (b++),
9 x (a++) - (b++),
23 x (a++) - (b++),
87 x (a++) - (b++).
Sayera said:
7 years ago
Please explain the solution clearly.
Nirvan said:
7 years ago
A x B = AB - ( A + B ) = Y.
8 x 2 = 16 - 10 = 6,
6* 3 = 18 - 9 = 9,
9 * 4 = 36 - 13 = 23,
23* 5 = 115 - 28 = 87,
87*6 = 522 - 93 = 429.
8 x 2 = 16 - 10 = 6,
6* 3 = 18 - 9 = 9,
9 * 4 = 36 - 13 = 23,
23* 5 = 115 - 28 = 87,
87*6 = 522 - 93 = 429.
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