Logical Reasoning - Number Series - Discussion

Discussion Forum : Number Series - Type 1 (Q.No. 4)

Number Series

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

Look at this series: 22, 21, 23, 22, 24, 23, ... What number should come next?

Answer: Option

Explanation:

In this simple alternating subtraction and addition series; 1 is subtracted, then 2 is added, and so on.

Discussion:

49 comments Page 4 of 5.

Jhansi said: 10 years ago

Logic of this problem is alternate addition to the numbers.

(1)

Siraj Dal said: 10 years ago

There is a 2 no.of sequence.

22, 21
23, 22
24, 23
?(25), 24

(1)

Dayanidhi parida said: 8 years ago

Thanks for explaining the solution.

(1)

Aaj said: 1 decade ago

Why not 22? 22 21 23, 22 24 23, 22 27 23 can also happen right?

(1)

JIYA said: 1 decade ago

There are alternative numbers 25.

= 22 23 24 -------.

And another alternative numbers:

= 21 22 23 24.

So the answer is 25.

(1)

Sudhansu said: 1 decade ago

Series of -1 then +2, therefore the answer is 25.

Mahesh langoti said: 3 days ago

22 - 1 = 21
21 + 2 = 23
23 - 1 = 22
22 + 2 = 24
24 - 1 = 23
23 + 2 = 25.

I think 25 is the correct answer.

Abhiram said: 2 decades ago

Another way to solve problem:

Sum alternatively it will get

22 + 1 = 23
23 + 1 = 24
21 + 1 = 22
22 + 1 = 23
so
24 + 1 = 25.

Santhikannan said: 1 decade ago

22-1=21
21+2=23
23-1=22
22+2=24
24-1=23
23+2=25
(Therefor 23+2=25)

Vishal said: 1 decade ago

We can see in in the pair of two number ...
(A)22 & 21
(B)23 & 22
(C)24 & 23
Answer in the series is (D) 25 & 24

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