Logical Reasoning - Number Series - Discussion
Discussion Forum : Number Series - Type 4 (Q.No. 12)
Directions to Solve
Find the number that fits somewhere into the middle of the series. Some of the items involve both numbers and letters
12.
Look at this series: 4, 7, 25, 10, __, 20, 16, 19, ... What number should fill the blank?
Answer: Option
Explanation:
Two series alternate here, with every third number following a different pattern. In the main series, 3 is added to each number to arrive at the next. In the alternating series, 5 is subtracted from each number to arrive at the next.
Discussion:
27 comments Page 3 of 3.
Banu Sivaguru said:
1 decade ago
Let us spilit the series innto two (a,b)... (a1,a2,b1)(a3,a4,b2) (a5,a6,b3) and so on..... if we see A series are increasing gradually with number 3like(4,7,10,...16,19) and b is the second set of series increase with 5(20,25) .....
So here we have to find out the missing number of a4(10+3=13)......
Hope you guys understood....
So here we have to find out the missing number of a4(10+3=13)......
Hope you guys understood....
Varun said:
1 decade ago
Thanks kaushik, it's really help me!
Ramkumar said:
1 decade ago
Hai @Wally.
Here: 4, 7, 25, 10, __, 20, 16, 19, ... ( TWO set of series).
Then,
Split series: (4, 7, 10, _, 16, 19, ........) +3 series.
(25, 20, 15,........) -5 series.
So the answer is 10+3 =13.
Here: 4, 7, 25, 10, __, 20, 16, 19, ... ( TWO set of series).
Then,
Split series: (4, 7, 10, _, 16, 19, ........) +3 series.
(25, 20, 15,........) -5 series.
So the answer is 10+3 =13.
Uday raj said:
1 decade ago
4, 7, 25 are the main series n next alternative number is 10 i.e. came by adding 4+3 is 7 and 7+3 is 10 and after 10+3 is 13 after than 25 is taken as last no of main series and we have to less 5 from every last no of main series. Then 25-5 is 20 finally the series is 3, 7, 25, 10, 13, 20, 16, 19, 15.
M.Mareeswari said:
1 decade ago
4 7 25 10 ____ 20 16 19.
4 + 3 = 7.
7 + 3 = 10.
10 + 3 = 13.
13 + 3 = 16.
16 + 3 = 19.
The number is added 3. Every third number is different pattern so the correct answer is 13.
4 + 3 = 7.
7 + 3 = 10.
10 + 3 = 13.
13 + 3 = 16.
16 + 3 = 19.
The number is added 3. Every third number is different pattern so the correct answer is 13.
Pons said:
1 decade ago
Every third number is subtracted by 5 i.e 25, 20, -.
And others a follow the pattern of adding 3 with the consecutive numbers, i.e 4, 7, 10, 13, 16, 19-.
And others a follow the pattern of adding 3 with the consecutive numbers, i.e 4, 7, 10, 13, 16, 19-.
Rhytham patel said:
1 decade ago
Not understanding still, explain with other example.
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