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 1 of 9.
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.
Praveen said:
1 decade ago
No sir. I did not get the answer.
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
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
Anil said:
1 decade ago
Why we should mutiply by 2 and add 8 ?
PANKAJ RIYAR said:
1 decade ago
14+14=28
28-8=20
20+20=40
40-8=32
32+32=64
64-8=56
28-8=20
20+20=40
40-8=32
32+32=64
64-8=56
PERNI .RAMBABU said:
1 decade ago
14
14*2=28
28-8=20
20*2=40
40-8=32
32*2=64
64-8=56
14*2=28
28-8=20
20*2=40
40-8=32
32*2=64
64-8=56
Vijender said:
1 decade ago
s1:14,20,32,n,n1.......
s2:2*14,2*20,2*32,m,m1
20-14=6*1
32-20=6*2
ans:
s1:
n=32+6*2*2=32+24=56
s2=s1*2
m=n*2=56*2=112
series:
s1:14,20,32,56,
s2:2*14,2*20,2*32,112,
series:
s2:14, 28, 20, 40, 32, 64, 56,112
s2:2*14,2*20,2*32,m,m1
20-14=6*1
32-20=6*2
ans:
s1:
n=32+6*2*2=32+24=56
s2=s1*2
m=n*2=56*2=112
series:
s1:14,20,32,56,
s2:2*14,2*20,2*32,112,
series:
s2:14, 28, 20, 40, 32, 64, 56,112
Nikhila said:
1 decade ago
Ya its ok with procedure. But why should we take the nums 2 and 8?
Pavan said:
1 decade ago
@P.Rajendran..thought of the same thing but the ans isn't there in the options...
Post your comments here:
Quick links
Quantitative Aptitude
Verbal (English)
Reasoning
Programming
Interview
Placement Papers