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Aptitude - Odd Man Out and Series - Discussion

Discussion Forum : Odd Man Out and Series - Find Wrong No. (Q.No. 4)
Odd Man Out and Series
Directions to Solve
Find out the wrong number in the series.
4.
445, 221, 109, 46, 25, 11, 4
221
109
46
25
11
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 2 of 3.
Viji said:   9 years ago
Good explanation, thank you @Nagendramurthy.
Raju Rockzz said:   9 years ago
Super explanation @Nagendramurthy.
Apoorv said:   9 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!
Kamlesh said:   8 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.
B.M.Aakash said:   8 years ago
Good explanation. Thank you all.
(1)
Lakshu said:   8 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.
Akhil said:   7 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.
(1)
Nandhajhon said:   7 years ago
Well explained, thanks, @Akhil.
Kannu said:   6 years ago
It should be 53.
Dhara said:   6 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?
(2)
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