Question

Which is the incorrect number in the following series?

5, 10, 29, 84, 247

Answer 1

Hello, I hate to say but there is no incorrect sequence/series. A sequence/series is just a bunch of numbers. Your question is wrong unless you provide what kind of sequence/series this is.

Answer 2

No.. the catch is, there is a series that is to be figured out... and a nunber that is the odd one in the series.. Im juz not able to find out wch one is the odd one...

Answer 3

Oh, got it.

Answer 4

Look:\[10 \times 3 - 1 = 29 \]\[29\times 3 - 3 = 84\]\[84 \times 3 - 5 =247\]

Answer 5

Look:\[10 \times 3 - 1 = 29 \]\[29\times 3 - 3 = 84\]\[84 \times 3 - 5 =247\]

Answer 6

Looking at that pattern, the first term shold be \(3\).

Answer 7

Looking at that pattern, the first term shold be \(3\).

Answer 8

\[3 \times 3 - (-1) = 10\]

Answer 9

Well i used a diff method to figure this out and it seems like 5 is the incorrect digit.

Answer 10

What was your method? And good to hear that I am not wrong :P

Answer 11

I am afraid my observation may seem not to be correct but i still would like to share it,

29/10=2.9

84/29=2.9

247/84=2.9

but,

10/5=2

Therfore,5 is the incorrect digit

I am sorry if i was wrong .

Answer 12

Arrey haan! Nice observation!

Answer 13

Haha,thanks.

Answer 14

Thanks to both of you... i got 2 different solution...

Answer 15

You're welcome.

But,@ParthKohli is better.

Answer 16

Actually @hba no!

Answer 17

I know i am wrong.

Answer 18

All the numbers except \(\dfrac{29}{10}\) are not \(2.9\) exactly. :\

Answer 19

Anyway, I gotta go. Good day all of you =)

Answer 20

That is why i was calling it a wrong method.

Bye.