Chef's Quick Brain Teaser, revisited

[Churchill]

I thought it was

x = (x * x) + x

Nope. Not from where I'm sat.

[OwlHoot]

(deleted)

[EternalOptimist]

Nope. Not from where I'm sat.

I can prove I'm right by using logic

[BrollyBonce]

All I can see in question 1 is

x = x * (x + 1);

If x1 = x0 * (x0 + 1)

then x0 * (x0 + 1) = x1

Where x1 = 1 calculate x0 and put it in the series.

[BrollyBonce]

Another HUGE hint.

What number came BEFORE in the series 1, 2, 6, 42, 1806, ...

I.e., what comes before the '1'?

[Bagpuss]

it should be X(n)=X(n-1)*[X(n-1) +1]

[Pinto]

Another HUGE hint.

What number came BEFORE in the series 1, 2, 6, 42, 1806, ...

I.e., what comes before the '1'?

0.6180339887498949

[Bagpuss]

I thought he already told us that.

Welcome to CUK does GCSE Maths

[DaveB]

Another HUGE hint.

What number came BEFORE in the series 1, 2, 6, 42, 1806, ...

I.e., what comes before the '1'?

Well to my simple mind, if the formula above was correct then if X1=1 X0 = 0

[oracleslave]

I thought he already told us that.

Welcome to CUK does GCSE Maths

Where's CUK's self proclaimed maths whiz?