Logical Reasoning - Number Series - Discussion

Discussion Forum : Number Series - Type 1 (Q.No. 12)

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

12.

Look at this series: 14, 28, 20, 40, 32, 64, ... What number should come next?

128

Answer: Option

Explanation:

This is an alternating multiplication and subtracting series: First, multiply by 2 and then subtract 8.

Discussion:

87 comments Page 2 of 9.

Nima dorji said: 4 years ago

Sir I didn't get it. Can anyone explain once more?

(5)

Aarushi said: 5 years ago

14*2 = 28 - 8 = 20,
20*2 = 40 - 8 = 32,
32*2 = 64 - 8 = 56.

(2)

Tirtha Datta said: 5 years ago

14 * 2 = 28,
(14 + 6) * 2 = 40,
(20 + 12) * 2 = 64,
(32 + 24) * 2 = 122.

(1)

ASWATH G said: 9 years ago

Answer is 56 only. I agree.

Nitish Pandey said: 9 years ago

I think the answer must be 128.

14*2=28.
20*2=40.
32*2=64.
64*2=128.

Bhavana said: 9 years ago

14*2=28.
28-8=20.
20*2=40.
40-8=32.
32*2=64.
64-8=56.

Vishal said: 9 years ago

I calculated 50 the next term. It is not matched. It is too difficult when a series has multiple answers.

14 - 20 - 32 - 50.
6 12 18.

Raj said: 9 years ago

@Aswath.

Why 50 is not an answer? I still can't understand. Can someone explain this to me?

KARTHICKRAJA said: 9 years ago

14 28 - Difference is 8 (28-8=20)
20 40 - Difference is 8 (40-8=32)
32 64 - Difference is 8 (64-8=56)
So, 56.

Nikhilaadarsa said: 9 years ago

Why 128 is not an answer? I still can't understand. Can someone explain this to me?

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