Thread: find wrong term

find the wrong term in the given series
63,28,215,511

Originally Posted by hena

find the wrong term in the given series
63,28,215,511

How about 28 because it is the only even number?

Hello,

Originally Posted by hena

find the wrong term in the given series
63,28,215,511

Well, there are many possibilities...

- the numbers are odd, so 28 is the wrong term
- the numbers are in an increasing order, so 28 is the wrong term
- the sum of the numbers is <10, so 28 is the wrong term
- the one I prefer : they are all multiples of 7, so 215 is the wrong term


And another one :
- I don't know what term to choose, and I don't want to bother, so is the wrong term

Originally Posted by hena

find the wrong term in the given series
63,28,215,511

Though I am pretty sure of my answer, I dont know why I am sure :P

The odd one out is 28 because the rest all are 1 short of a power of 2

Originally Posted by Isomorphism

Though I am pretty sure of my answer, I dont know why I am sure :P

The odd one out is 28 because the rest all are 1 short of a power of 2

Well, ähemm - isn't there is a slight difference between 215 and 255

Originally Posted by earboth

Well, ähemm - isn't there is a slight difference between 215 and 255

Hello, hena!

Find the wrong term in the given sequence: 63, 28, 215, 511

Think cubes . . .


We have: .

The terms are of the form:
. . except 28, which is . . . and is in the wrong position.

Originally Posted by neha1

find the wrong term in the given series
63,28,215,511

There's no wrong term. Furthermore, a possible fifth term is 803. Followed by 978, 923, 525, -329, .......