Brain Breakers

[Maxstar]

The pseudorandom generator = x[n+1]=(8x[n] + 7) mod 50
Let's start from: x[0]=11, In which interval is the period of the sequence obtained?

Spoiler

1) [1,10]
2) [11,20]
3) [21,30]
4) [31,40]
5) [41,50]

 

[A Guy]

A Guy

 

[Maxstar]

New try in this thread with another one..

Spoiler

 

[DR M]

12!!!!

 

[Corday]

18 before spoiler.

 

[DR M]

OUPS! I didn't see the spoiler! Doesn't count I guess. :)

 

[Maxstar]

Move only one matchstick to solve the sum!

 

[Corday]

Take the vertical stick from the plus sign and insert in upper right side of 5 turning it into a 9. 9-7=2

 

[Maxstar]

This one was too easy I guess..

 

[Maxstar]

Next one.

 

[DR M]

The only thing I can think is:

7 - 11 ≠ 5 (move the horizontal match from 17 and put it above the equal sign)

 

[Maxstar]

I guess you're right , just move the horizontal match from 17 on top to the middle 7 - 1 - 1 = 5....

 

[DR M]

Oh!

That way the equation remains as such! Clever!!!

 

[Maxstar]

I really like such things and puzzles which are usually quite simple and sometimes very tricky...

 

[A Guy]

Move only one matchstick to solve the sum!

View attachment 120844

How about remove the vertical match in the plus and put it horizontal before the 2? 5 - 7 = -2

Or is that considered moving the 2?

A Guy

PS My brain is already broken