# 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 2 of 3.

Apoorv said:   6 years ago
Sum every digit of every number in the series.

4 5 1 1 7 2 4. There's anyhow increase and decrease in the difference of number. Except 1 at the 4th place. Which corresponds to 46!

Raju Rockzz said:   7 years ago
Super explanation @Nagendramurthy.

Viji said:   7 years ago
Good explanation, thank you @Nagendramurthy.

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

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

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.

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

Satya said:   9 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?

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.