Logical Reasoning - Number Series - Discussion
Discussion Forum : Number Series - Type 1 (Q.No. 12)
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?
Answer: Option
Explanation:
This is an alternating multiplication and subtracting series: First, multiply by 2 and then subtract 8.
Discussion:
85 comments Page 9 of 9.
Anil said:
1 decade ago
Why we should mutiply by 2 and add 8 ?
Ravikumar said:
1 decade ago
14*2=28,28-8=20;
20*2=40,40-8=32;
32*2=64,64-8=56;
yes this is the procedure
20*2=40,40-8=32;
32*2=64,64-8=56;
yes this is the procedure
Vishnu Sharma said:
1 decade ago
14*2=28-8=20*2=40-8=32*2=64-8=56*2=112
14 28 20 40 32 64 56 112
14 28 20 40 32 64 56 112
Praveen said:
1 decade ago
No sir. I did not get the answer.
P.Rajendran said:
2 decades ago
There is one more solution for the above ques..but the answer s not there in options. Try it. Check let us take alternate no's 14,20,32,?
14+6=20
20+(6*2)=32
32+{6*3)=50...ans.
For verification--
now we can able to see that each alternate no's are half to its next no.
14*2=28 so on..
therefore 50*2=100...{1}
now,
28+12=40
40+{12*2)=64
64+{12*3)=100....(2)
You got the answer.
14+6=20
20+(6*2)=32
32+{6*3)=50...ans.
For verification--
now we can able to see that each alternate no's are half to its next no.
14*2=28 so on..
therefore 50*2=100...{1}
now,
28+12=40
40+{12*2)=64
64+{12*3)=100....(2)
You got the answer.
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