# Aptitude - Odd Man Out and Series - Discussion

Discussion Forum : Odd Man Out and Series - Find Wrong No. (Q.No. 4)
Directions to Solve
Find out the wrong number in the series.

4.
445, 221, 109, 46, 25, 11, 4
221
109
46
25
11
Explanation:

Go on subtracting 3 and dividing the result by 2 to obtain the next number.

Clearly, 46 is wrong.

Discussion:
23 comments Page 1 of 3.

series is wrong....think so

if wrong number is 46

it should be 445,221,109,53,46(45),21,9,3...

it's 46

Let me explain ..

445-3=442
442/2=221

221-3=218
218/2=109

109-3=106
106/2=53

53-3=50
50/2=25

25-3=22
22/2=11

11-3=8
8/2=4

So after 109 it should be 53.. in the given series it is 46 so

Have a nice day..!

Nice explanation by Mr. Nagendramurthy. Thanks.

4*2+3=11
11*2+3=25
25*2+3=53 ------------ 46 which is an wrong series.
53*2+3=109
109*2+3=221
221*2+3=445

You might can understand this.

Satya said:   10 years ago
I had solved this problem like this.
Starting from the end.

4.
4+7=11,
11+14=25,
25+21=46,
46+28=74. So 109 is wrong.

Can anybody say whether the way is correct are not? and why?

Yes 109 is wrong because 74* 35=2590 which is not the next number in the given series?

BoB said:   9 years ago
Hi but how did you find that it must be subtracted by 3 and multied by 2, seeing the question ? can any one help please.

Srinithi said:   8 years ago
Its really a tough question. Could not judge the way in which the series is written?

Albert said:   7 years ago
Very tough to find the answer.