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:
113 comments Page 5 of 12.
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:
8 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.
Abhishek said:
8 years ago
Any other simple formula?
BHAGMAT TUDU said:
8 years ago
@Bala Chandu.
The answer is 14, 916, 2536, 4964.
The answer is 14, 916, 2536, 4964.
Anil said:
9 years ago
@All.
This question was asked in 2011 FSO exam.
This question was asked in 2011 FSO exam.
Aloj said:
9 years ago
8 * 1 = 8 - 2.
6 * 2 = 12 - 3.
9 * 3 = 27 - 4.
23 * 4 = 92 - 5.
87 * 5 = 435 - 6.
429 answer.
6 * 2 = 12 - 3.
9 * 3 = 27 - 4.
23 * 4 = 92 - 5.
87 * 5 = 435 - 6.
429 answer.
Bala chandu said:
9 years ago
Answer the series.
14, 916, 2536, ?.
14, 916, 2536, ?.
Ramya said:
9 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
So, the answer is 429.
6 * 2 = 12 - 3 = 9
9 * 3 = 27 - 4 = 23
23 * 4 = 92 - 5 = 87
87 * 5 = 435 - 6 = 429
So, the answer is 429.
Syed Mahi Ahmed said:
9 years ago
Thanks everybody for the explanation. Now I understand this.
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