Aptitude - Odd Man Out and Series - Discussion

Discussion Forum : Odd Man Out and Series - Find Wrong No. (Q.No. 1)
Directions to Solve
Find out the wrong number in the series.

1.
7, 8, 18, 57, 228, 1165, 6996
8
18
57
228
1165
Answer: Option
Explanation:

Let the given numbers be A, B, C, D, E, F, G.

Then, A, A x 1 + 1, B x 2 + 2, C x 3 + 3, D x 4 + 4, E x 5 + 5, F x 6 + 6 are the required numbers.

Clearly, 228 is wrong.

Discussion:
22 comments Page 1 of 3.

NANDINI said:   1 decade ago
The given series 7, 8, 18, 57, 228, 1165, 6996

And the given series in the format of

A, AX1+1, BX2+2, CX3+3, DX4+4, EX5+5, FX6+6, GX7+7

BECAUSE CHECK THE SERIES

A=7
AX1+1=7X1+1=8
BX2+2=8X2+2=18
CX3+3=18x3+3=57
Dx4+4=57x4+4=232 < Here is the wrong>
Ex5+5=232x5+5=1165 This is the process.

Sundar said:   1 decade ago
Initial value = 7

7 x 1 + 1 = 8

8 x 2 + 2 = 18

18 x 3 + 3 = 57

57 x 4 + 4 = 232 (But given number 228 is out of pattern)

232 x 5 + 5 = 1165

1165 x 6 + 6 = 6996 ... and so on.

Hope you understand the logic behind this problem. Have a nice day?

Niharika said:   7 years ago
It can also be done as:

A, (A+1)X1, (B+1)X2, (C+1)X3, (D+1)X4, (E+1)X5, (F+1)X6.
i.e.,

A = 7.
B = (7+1)X1 = 8.
C = (8+1)X2 = 18.
D = (18+1)X3 = 57.
E = (57+1)X4 = 232.
F = (232+1)X5 = 1165.
(3)

Girish said:   6 years ago
@Suvra Saurav

I think may be 96 is 196.

Because 196- 14^2.
169- 13^2
144- 12^2
121- 11^2
And there is "101" wrong number.

Suvra Saurav said:   7 years ago
Can any one solve this for me?

96, 169, 144, 121, 101 find the wrong number.

Tapan ghosh said:   8 years ago
Thanks @Nandini and @Sundar. Logic is very easy after your explanation.

Shariq said:   8 years ago
Thanks @Sundar and @Nandini! Logic is very clear and understandable.

Parikshit Sahoo said:   1 decade ago
I didn't get how the answer is 228. Can you please explain ?

Jeeva said:   8 years ago
I can't understand this logic sir. Can you please explain?

Arjun said:   8 years ago
This is simple method @Jeeva. Try yourself to understand.


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