# 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

Answer: Option

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.
Kartik said:
3 years ago

11 is the only one which is prime no. So the answer is option D.

(1)

Harshita said:
3 years ago

@Dhara.

Your way of solving the question is wrong because then the given series is proved wrong.

4+7=11.

11+14=25,

25+21=46,

46+28=74,

74+35=109,

109+42=251.

Hence the given solution is correct.

Your way of solving the question is wrong because then the given series is proved wrong.

4+7=11.

11+14=25,

25+21=46,

46+28=74,

74+35=109,

109+42=251.

Hence the given solution is correct.

(2)

Kamali said:
4 years ago

It could be cracked easily when solved from right to left.

Multiplying 2 and adding 3 to the multiplied result.

(4*2)+3 = 11.

(11*2)+3 = 25.

(25*2)+3 = 53.

(53*2)+3 = 109.

(109*2)+3 = 221.

(221*2)+3 = 445.

So, 46 is the wrong answer.

Multiplying 2 and adding 3 to the multiplied result.

(4*2)+3 = 11.

(11*2)+3 = 25.

(25*2)+3 = 53.

(53*2)+3 = 109.

(109*2)+3 = 221.

(221*2)+3 = 445.

So, 46 is the wrong answer.

(2)

Dhara said:
4 years ago

4.

I solved the question in this way.

4+7 = 11,

11+14 = 25,

25+21 = 46,

46+28 = 74.

So, 109 should be wrong.

I am right, Can anyone tell me?

I solved the question in this way.

4+7 = 11,

11+14 = 25,

25+21 = 46,

46+28 = 74.

So, 109 should be wrong.

I am right, Can anyone tell me?

Kannu said:
4 years ago

It should be 53.

Nandhajhon said:
5 years ago

Well explained, thanks, @Akhil.

Akhil said:
5 years ago

4+7=11, 11+14=25, 25+28=53, 53+56=109,

Start adding with 7 then after 7*2, then the answer with 2. That's it.

Start adding with 7 then after 7*2, then the answer with 2. That's it.

Lakshu said:
6 years ago

We can simply do that:

445-221 = 224

224/2 = 112

221-109=112

112/2 = 56

109-46 = 63, So 46 is the wrong answer.

445-221 = 224

224/2 = 112

221-109=112

112/2 = 56

109-46 = 63, So 46 is the wrong answer.

B.M.Aakash said:
6 years ago

Good explanation. Thank you all.

Kamlesh said:
6 years ago

The general form of the series is sigmal of GI (n\2) -1 put n=445 you will get 222.5 but GI of 222.5 is 222 subtract 1 from it you will get 221 and then put 221 on the series and so on.

Post your comments here:

Quick links

Quantitative Aptitude

Verbal (English)

Reasoning

Programming

Interview

Placement Papers