Let's See How Quick You Are!

Even if they got the right answer, architects would change it - Ooops, sorry, they would, "allow it to become what it wants to be".

x = n(n+1)

I got the next number in 30 seconds

What the heck is in it for someone to take 3 minutes in doing?

Then comes 6 hours!

If you cannot do it in 5 minutes you will probably not be able to do in 5 years

Stedou

Can you solve this?

6, 20, 442, 194040, ???

i have an equation for 6,20,342,194040... not 442. i am keen to know the correct answer.....

So sorry..

Let me correct:

6, 20, 462, 212060, ????

i am lost again ...

i have the series for 6,23,462,212060,....

I will reply tomorrow, let us wait if some body comes forward to reply correctly.

In the meanwhile, you may also try little more.

Sorry...big bloomer. The series that i gave here is wrong, no pattern 6,23,... apologies

It must be asked properly before a proper answer can be given.

I wholeheartedly agree with you. I said sorry. Once again I say sorry

Now, can you reply my series?

6, 20, 462, 212060, 44,970,079,782

n_i+1 = n_i² + (-1)ⁱ(3n_i) + 2

You are right.

This I formed just to show that how it is easy to form some series, but it may be quite challanging to decipher it.

The OP was too simple. Besides, probably poster of OP just copied it from somewhere without thinking over it. It is evident from that "excel" matter.

The OP was too simple. Besides, probably poster of OP just copied it from somewhere without thinking over it. It is evident from that "excel" matter.

Yes you are right. It was easy and copied from a chain that I received. However if you read post #4 that explained it.

This was an exercise in fun for all. Not a who's smarter post, so it was thought over on a day that I was in a funk and wanted to share fun with fellow engineers. Yes CR4 does not allow us to copy excel files to their domain but I copied the original question that was sent to me in its entirety.

That said, play nice, no need for words to demean others. Remember you are no better than the rest of us here, just different.

Any more comments like that and you will need to take a 30 min time out.

6, 20, 442, 194040, 37,651,909,682

Now that is worth the GA.

Actually I forgot to delete the 3 when I cut & paste from the previous equation. Should be:

n_i+1 = n_i² + (2.5 - (-1)ⁱ/2)(n_i) + 2

GA

3263442,,,two minuets.

Joe in Texas

ok, it took me 30sec to figure out what the progression was, and another minute or so to calculate the result for the missing number...

simplest way to express the progression is x+x^2=y...and y becomes the next x and so on

Given n numbers, an (n-1) degree polynomial can be found to generate them. No matter what the (n+1)^st number is, an n^th degree polynomial can generate it. Thus all such questions have more than one answer. Some of the answers will be simpler or more elegant than others. Plus cute tricks like (-1)²ⁿ to generate alternating +/- numbers. Or even "cleverer", such stuff as (-1)^{n(mod m)} to force other +/- patterns.