Aptitude - Odd Man Out and Series - Discussion
Discussion Forum : Odd Man Out and Series - Find Wrong No. (Q.No. 9)
Directions to Solve
Find out the wrong number in the series.
9.
40960, 10240, 2560, 640, 200, 40, 10
Answer: Option
Explanation:
Go on dividing by 4 to get the next number.
So, 200 is wrong.
Discussion:
8 comments Page 1 of 1.
Ravi said:
4 years ago
40960 = 64^2 * 10.
10240 = 32^2 * 10.
And so on but 200 can't be written like this.
So 200 is the answer.
10240 = 32^2 * 10.
And so on but 200 can't be written like this.
So 200 is the answer.
Niharika said:
7 years ago
From the last term of the series: (consider " * " as "to the power of").
10 x 2 * 0 = 10
10 x 2 * 2 = 40
10 x 2 * 4 = 160(not 200 which is given)
10 x 2 * 6 = 640
10 x 2 * 8 = 2560
10 x 2 * 10 = 10240
10 x 2 * 12 = 40960.
10 x 2 * 0 = 10
10 x 2 * 2 = 40
10 x 2 * 4 = 160(not 200 which is given)
10 x 2 * 6 = 640
10 x 2 * 8 = 2560
10 x 2 * 10 = 10240
10 x 2 * 12 = 40960.
Gowri rudra said:
8 years ago
According to other procedure 640 is also one of the answer.
Satya said:
9 years ago
How to understand that we have to divide by 4?
Priyanka said:
9 years ago
10 40 200 640 2560 10240 40960
Multiply by 4,
10*4 = 40.
40*4 = 160.
160*4 = 640.
640*4 = 2560..... Instead of 160 there is 200. So answer is 200.
Blind method
----------------
Observer last two digits.. in series.
40960, 10240, 2560, 640, 200, 40, 10
60, 40, 60, 40, 00, 40, 10
So 10 is not in Answer option.
So 00 is the answer == 200 :).
Multiply by 4,
10*4 = 40.
40*4 = 160.
160*4 = 640.
640*4 = 2560..... Instead of 160 there is 200. So answer is 200.
Blind method
----------------
Observer last two digits.. in series.
40960, 10240, 2560, 640, 200, 40, 10
60, 40, 60, 40, 00, 40, 10
So 10 is not in Answer option.
So 00 is the answer == 200 :).
(2)
Akshay said:
10 years ago
It has perfect square and it multiply by 10. But in 10, 200, 10240.
It is not an perfect square. In option 10 and 10240 is not given so it has out of choice. Hence 200 is correct.
It is not an perfect square. In option 10 and 10240 is not given so it has out of choice. Hence 200 is correct.
Indhumathi said:
1 decade ago
No, answer is 200 because
40960/4 is 10240.
10240/4 is 2560.
2560/4 is 640.
640/4 is 160.
But here they give 200, see
160/4=40 next number will be correct,
So the answer is 200, here 200 is wrong.
40960/4 is 10240.
10240/4 is 2560.
2560/4 is 640.
640/4 is 160.
But here they give 200, see
160/4=40 next number will be correct,
So the answer is 200, here 200 is wrong.
Madhu said:
1 decade ago
The answer should be 640. Because when it divided by 4, it does net get the next number.
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